Xuan Haijun

Xuan Haijun
Zhejiang University | ZJU · Highspeed Rotating Machinery Laboratory

PhD

About

51
Publications
19,133
Reads
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388
Citations
Introduction
My major research areas are application solid mechanics for highspeed rotating machinery. I got doctor degree June 2004 from Zhejiang University, was a lectuer in Zhejiang University from September 2004, was an associate professor and the director of HiRoMa Lab. ZJU from November 2006.
Additional affiliations
September 1999 - October 2016
Zhejiang University
Position
  • Laboratory PI

Publications

Publications (51)
Preprint
In order to explore the critical charge diameter for explosive separation of titanium alloy plates under the structure of double-hole charge. In this paper, based on the SPH algorithm in the AUTODYN software, a numerical model of the explosion separation of titanium alloy plates was established, and numerical simulations were carried out for differ...
Article
To realize the explosive separation of carbon-fiber-reinforced composites under a linear-shaped charge, the failure mode of the materials under a linear-shaped charge jet was obtained by combining numerical simulation with experiment. Results show that under the action of the shaped charge jet, the three main failure modes of composite materials ar...
Article
Full-text available
By using the C-shaped metal lead shell and copper shell to wrap the detonating cord, the restraint of the explosion energy is improved, and the simple charge structure is used to achieve the purpose of effectively separating the carbon fiber composite woven plate in a limited and small space. The commercial software AUTODYN was used for numerical s...
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Labyrinth-honeycomb seals are a state-of-the-art sealing technology commonly used in aero-engine interstage seal. The undesirable severe rub between the seal fins and the honeycomb due to the clearance change may induce the cracking of the seal fins. A pervious study investigated the wear of the seal fins at different radial incursion rates. Howeve...
Article
Crack growth evaluation should be performed to certify that the fan disc is capable of maintaining adequate integrity in presence of cracks. The spin test was carried out using the pre-flawed fan disc to obtain a more intensive insight of crack growth characteristic in the bore area. The variation of the surface crack length was measured by the rep...
Article
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Labyrinth seals as a noncontact sealing technology are widely used in aero-engine. To improve the efficiency of the aero-engine, the clearance between the rotor and stator must be as small as possible. However, the change of the clearance between the rotor and stator because of thermal expansion, vibration, mechanical loading may lead to undesirabl...
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The multi-source fatigue crack growth characteristics of a turbine disk were studied via high-speed rotating low cycle fatigue test, fracture analysis and crack growth simulation analysis. The results show that the fatigue initiation life N 0 of Superalloy disk and its simulation parts is less dispersive and similar, and the S - N 0 curve of the ma...
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To investigate the containment characteristics and mechanisms of axial compressor blade and casing in turboshaft engine, experimental and simulation research is conducted on Titanium alloy axial compressor blades and stainless steel simulator casings in this paper. Experiments for four thicknesses (from 0.8 mm to 1.4 mm) of casings are presented on...
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Three-dimensional woven composites have been reported to have superior fracture toughness, fatigue life and damage tolerance compared with laminated composites due to through-thickness reinforcement. These properties make them lighter replacements for traditional high-strength metals and laminated composites. This paper will present impact resistan...
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Aramid fabrics have been commonly used in the civil turbofan engine fan blade containment system for its excellent performance. To investigate the behavior and capability of soft wall containment casing, a series of fan blade released tests were conducted on the high-speed spin tester. The soft wall casing was fabricated by wrapping multiple layers...
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The Kevlar 49 composite material (DuPont, Wilmington, Delaware), which is of light weight and high strength, is used increasingly as a containment structure for fan blades. This paper proposes a spinning impact testing method to investigate the containment ability of Kevlar 49 composite case after fan-blade-out (FBO) events. Three spinning impact t...
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The FBO certification test is enforced before a new civil turbofan engine can be allowed to enter into production. This test is extremely expensive. Thus, an accurate and reliable blade release method is quite essential. Traditional notched blade method and pyrotechnic method have some disadvantages such as labor-intensive or undefined energy added...
Article
To investigate the centrifugal compressor disk containment of auxiliary power unit (APU) in gas turbine, research on specific compressor is conducted in combination of simulations and tests. Nonlinear explicit finite element analysis of tri-hub fragments impacting containment assembly is carried out using LS-DYNA. Impacting characteristics in each...
Article
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Abradable seal rubber has been widely used in aero-engine fans to improve their efficiency by reducing the clearance between rotating and stationary components. To investigate the high-speed scraping behavior between a vulcanized silicone rubber and a Ti-6Al-4V fan blade and evaluate the abradable performance of seal rubber, abrasion tests were con...
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The labyrinth-honeycomb seal has been widely used in gas turbine engines as an abradable gas path seal to protect the rotor from wear and damage in rubbing interaction. It usually works with a stepped labyrinth because the knife-edged tips could produce a special dynamic sealing system, and then the minimum clearance is possible between the rotor a...
Article
To investigate the containment mechanism of the soft wall casing, a series of tests were conducted on a high-speed spin tester. A special testing method using spin tester for the containment of soft wall casing is developed. The subscale casing was fabricated by wrapping multiple layers of Kevlar49 plain woven fabric around the inner thin aluminum...
Article
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In this paper, a modified laminated finite-element model based on subcell of unit cell and CDM material model was developed in nonlinear explicit finite-element code to investigate the dynamic response of 2D triaxial braided composite under ballistic impact of projectile. Six subcells, which were considered as laminate with different stacking seque...
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High-energy rotor uncontained failure can cause catastrophic damage effects to aircraft systems if not addressed in design. In this paper, numerical simulations of three high-energy rotor disk fragments impacting on U type protection rings are carried out using LS-DYNA. Protection rings with the same mass and different groove depths are designed to...
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The application of abradable seal coating is an effective method to improve the efficiency of turbine engines. The AlSi-polyester is a typical one, which has been widely used in mediate and low pressure compressors. To evaluate abradable performance and investigate wear mechanisms of these seal coatings, a high-temperature and high-velocity tester...
Article
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To study the effects of multi-blade interaction on the blade containment capability of the aero-engine casing, series of blade containment tests and the corresponding numerical analysis for the fan and the turbine components are carried out. Numerical models are validated through the correlation of the numerical results with the experimental data....
Article
In reciprocating compressors, partial unloading stepless capacity regulation causes the power consumption to reduce in proportion to the decrease in capacity. To enable the widespread application of this method, it is necessary to analyse the changes in the mechanical status of a reciprocating compressor while its capacity is being regulated. This...
Article
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Two dimensional (2D) triaxial braided composites have been successfully used in aero-engine fan containment system for weight reduction. In the current study, blade containment tests were conducted on high-speed rotor spin tester to investigate the containment process and failure mechanisms of the composite casing. The composite casing was fabricat...
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Structure vibration response of rotor-bearing-case-installation section system caused by sudden unbalance load due to blade out of the high-speed flexible rotor has been the focus in the field of aero-engine development. This paper deals with the sudden unbalance response characteristics of a high-speed flexible rotor during a blade out event. To r...
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To investigate the high-velocity impact response and damage evolution of the triaxial braided composite fan case, a series of ballistic impact tests using blade-like projectiles were conducted. Cylindrical projectiles of the same cross-section perimeter were also employed to identify the influence of projectile geometry. In addition, satin woven co...
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A series of ballistic tests on triaxial braided carbon/epoxy composites were described in Part I of this paper. In this part, numerical simulations were carried out to investigate the impact response, damage evolution, and penetration mech-anisms of these composites. A continuum finite element model was developed to obtain the time history of the p...
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With the development of aviation industry, more and more performance requirements are submitted to aero-engines, and structure response and safety problem of aero-engine is concerned. Overview is made of the recently years full engine vibration response due to blade-off. And summary about case containment and rotor dynamic response caused by sudden...
Article
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To investigate the impact resistance and damage failure mechanisms of a composite aeroengine case, the subscale containment test was conducted on a high speed spin tester and numerical simulations were carried out using an explicit transient dynamic code. The impact process between the released blade and the composite case was investigated to obtai...
Article
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To improve gas turbine performance, it is essential to decrease back flow gases in the high-temperature combustion region of the turbo machine by reducing the shroud/rotor gap. An abradable seal coating will function effectively. The present work described an advanced detection technology and test rigs to study abradability of the seal coatings. Se...
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Finite element model based on yarns of triaxial braided textile is developed using LS-DYNA to investigate its dynamic response under ballisitic impact of flat-ended cylindrical projectile. The deformation and energy absorption properties of braided textile under two boundary conditions are analyzed. The result shows that the dynamic responses of br...
Article
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The impact test and simulation of stiffened targets are conducted to investigate the effects of stiffeners on the containment ability of the titanium case of aeroengine. The target plates are cut from an aeroengine case, and two kinds of projectiles are used in impact test. The test results are analyzed and used to prove the accuracy of simulation...
Article
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Disk burst accidents sometimes happen in aeroengines. To avoid tragic consequences, aeroengine casings must have sufficient containment capability. Experiments and simulations need to be conducted to study the impact, distortion, and perforation caused by disk burst and which may give important clues to potential failure mechanisms. This paper pres...
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Ballistic impact tests were preformed on triaxial braided composite panels using blade-like projectile in a way that approximates the impact velocity, deformation modes, and strain energy density at failure for composite fan case material during blade-out event. The failure modes are identified from impact test results. The main failure modes are f...
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To investigate multi-blade effects on aero-engine fan casing containment capability, numerical simulations combined with a component experiment are necessary. In this paper, good agreements with the experiment results are obtained from the numerical simulations employing a refined enough mesh and suitable material relations with proper values. It i...
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An experimental and numerical investigation on the aeroengine blade/case containment analysis is presented. Blade out containment capability analysis is an essential step in the new aeroengine design, but containment tests are time-consuming and incur significant costs; thus, developing a short-period and low-cost numerical method is warranted. Usi...
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To study the mechanism of the aero-engine fan blade containment process at the maximum operating speed and the effects of multiple blade interaction on it, several numerical simulations with three different computational models based on the real aero-engine first-stage fan component were carried out. Results show that uncontained failure is observe...
Article
To investigate the failure mechanism of a kind of 2D tri-axial braid carbon fiber reinforced composite fan case, a blade/case containment test was carried out in the high-speed spin tester and its numerical simulation based on continuum damage constitutive mechanics was conducted also. The numerical simulation results are in good agreement with the...
Article
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To study the mechanism of the impact of the aero-engine's broken blade against the fan case, a containment experiment was carried out in a high-speed rotating test apparatus, a finite element model with more refined mesh and suitable material parameters was built by using ANSYS/LS-DYNA, and simulations were carried out. The simulation results coinc...
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Development status and trends of aero-engine containment case were reviewed in respect of the containment capability definition, case material, design concept and method, validity testing, numerical simulation, failure and deformation patterns of case and released blade. Requirements of lightweight fan case with high containment capability for the...
Article
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To study the aeroengine containment capability of the case for high-speed released blade, numerical simulations of the blade project impact thin plate with the variation of a yaw angle and an initial velocity are done. The constitutive material model and the fracture model criterion proposed by Johnson and Cook, which takes into account the effect...
Article
In order to avoid disk failure to cause uncontained accidents, the containment capability of cylindrical case to the disk frgments must experimentally be investigated, and the impact, deformation, penetration or perforation of the case must be studied in detail. The results of three containment tests of disk fragments were proposed by the ZUST1 hig...
Article
In order to investigate the ballistic resistance and failure pattern of the casing with the impact of disk fragment, and find out structure optimization method, the phenomena of 1/3 disk fragment impacting on single and double layers plate target were simulated using nonlinear dynamical analysis software Dytran. Johnson-Cook material model was intr...
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To investigate the ballistic resistance and failure pattern of aeroengine casing following the impact of disk fragments, and to determine the optimum case structure, the phenomena of a 1/3rd disk fragment impact on single and double-layered thin plate targets were simulated using nonlinear dynamical analysis software MSC.Dytran. Strain rate effect...
Article
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The blade containment test is regarded as an essential assessment of aeroengine safety. This paper presents the results of a series of blade containment tests where a double edge notched blade was released at certain rotating speed which subsequently impacted the inner wall of the containment ring. These tests were conducted over a range of blade l...
Article
To verify the damping performance of elastomer O-rings damper (EORD), the unbalance response of a high speed overhung flexible rotor supported by EORD was investigated in a high-speed spin facility. The rotor speed was increased gradually over the range of 0-24000 r/min and decreased naturally with the power closed. The corresponding speed and vibr...
Article
A finite element model of the rotor system with a disk located at one-third span of the shaft was presented to investigate the dynamic characteristics of a single-disk rotor system with the ends mounted on viscoelastic elastomeric dampers (VED). The modal shapes of the rotor were obtained by solving the complex eigenvalues problem of global motion...
Article
In order to have more understanding of the process of breaking off blade impact on containment ring, a series of impacting tests to investigate the aero-engine containment capability has been carried out in a high speed spin facility. Single plate blade was used during the tests. Impacting processes were simulated with finite element numerical meth...

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Projects

Projects (3)
Project
1). High-speed abradable seal coating performance; 2). High-speed abradable behavior of labyrinth-honeycomb seal; 3). High-speed abradable seal rubber in aero-engine fan application. 4). High-speed >300m/s, high-temperature ~1000 degrees Celsius.
Project
1). Rotor low cycle fatiuge life calculation method; 2). Rotor crack propagation life analysis method; 3). Life extension for fracture critical aero-engine components.
Project
1). Engine blade containment research; 2). High-energy rotor disk containment research; 3). FBO caused rotor and full engine structure vibration response; 4). Softwall containment case design methods; 5). Carbon fiber infored fan blade and case design methods.