Yi Ping

Yi Ping
Shanghai Jiao Tong University | SJTU

Postdoc

About

40
Publications
8,264
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339
Citations

Publications

Publications (40)
Article
Ammonia is an attractive alternative fuel for internal combustion engines because it has an octane number above 110 and produces zero carbon oxide emissions compared to traditional fossil fuels. Due to its low boiling point, liquid ammonia is highly susceptible to flash boiling even at high ambient pressures under engine-like conditions. However, t...
Article
Molecular dynamics (MD) simulation is a powerful tool to reveal the microscopic characteristics of supercritical transitions. However, the accuracy of MD depends strongly on the potential model that describes the interaction forces between atoms. In this study, four commonly used potential models for long-chain n-alkanes in MD simulations are evalu...
Article
Full-text available
Semi-closed supercritical CO2 (sCO2) gas turbine is a promising candidate for the next generation power cycles with high efficiency and almost 100% carbon capture. In this study, the multicomponent effects on the sCO2 systems are investigated. A real-fluid modeling framework based on the vapor-liquid equilibrium (VLE) theory is implemented to predi...
Article
In this study, the non-equilibrium evaporation and transcritical transition processes of the n-heptane/ethanol blends under the pure nitrogen condition are firstly analyzed, and a new transcritical criterion for the multi-component mixtures is suggested based on the molecular dynamics simulation. Firstly, the employed force fields for the n-heptane...
Article
Ammonia, as a carbon-free fuel, is drawing more and more attention due to its potential of decarbonization for marine engines. The dual-fuel mode that can compensate for the poor combustion properties of ammonia has exhibited some prospects for practical application, but more relevant researches are urgent to promote the carbon-free fuel, especiall...
Article
Full-text available
The possibility of lube oil droplets’ existence in cylinders for two-stroke low-speed gas engines is higher because of the much higher lube oil consumption rate. Some droplets are directly injected into cylinders by lube oil injectors, and some are blown into cylinders through the scavenging ports. Autoignition of cylinder oil droplets is the main...
Article
The trans-critical transition of multi-component sprays under the ECN Spray-A conditions has attracted extensive interest. However, the drastic change of critical points of multi-components makes this controversial. In this study, the trans-critical transition of sprays before and after the end of injection is evaluated by numerical methods, and ne...
Article
The spray evolution and thermal pyrolysis of the heavy fuel oil (HFO) and its blends with #2 diesel were firstly investigated. First, the gas chromatography was performed to analyze their molecular distributions. The low sulfur HFOs with different viscosities show similar molecular distributions, and the content of light-end C 9-C 17 alkanes and po...
Article
Ammonia, as a zero-carbon fuel, is drawing more and more attention. The major challenge of using ammonia as a fuel for the combustion engines lies in its low chemical reactivity, and therefore more fundamental researches on the combustion characteristics of ammonia are required to explore effective ways to burn ammonia in engines. In this study, th...
Article
Marine diesel engines usually span a large range of bore diameters or power. While optimization of spray combustion system based on scaled model experiments would be beneficial to reduce the cost, energy consumption and project cycle of marine engine development, the similarity ratio effects on the design target parameters such as in-cylinder maxim...
Article
The spray characteristics of low sulfur heavy fuel oil (HFO) are firstly investigated by the experimental and numerical methods, and some new findings are obtained. First, the experiments have been conducted to evaluate the influence of low-sulfurization on the spray characteristics for HFOs under varied conditions, while little effect is found on...
Article
Multiple-injection strategy that has been applied widely in diesel engines usually features a short duration for each injection pulse. As a result, the shortened injection makes the needle opening and closing transients increasingly important for spray in an injection event. Owing to the needle movement, the spray development during the transient p...
Article
The start of injection (SOI) transition processes present challenges for diesel spray combustion simulations by computational fluid dynamics (CFD). In the previous studies, claims are usually placed on the experimental uncertainties or numerical methods such as grid size selection and sub-model comparison. Until now, few studies have been attempted...
Article
The emphasis of this paper is to explore the gas-liquid interface characteristics of binary-component n-alkane fuels composed of n-heptane and n-dodecane at sub/supercritical nitrogen environments, and examine the vapor-liquid equilibrium (VLE) assumption adopted in the continuum-based vaporization models using the molecular dynamics simulation. In...
Conference Paper
Full-text available
The performance of both internal combustion engines and gas-turbines/aircraft-engines are highly sensitive to the characteristics of liquid fuel spray injection. To do a proper simulation of engine combustion, the first step is typically tuning the parameters of spray atomization breakup submodels for the specified conditions. However, properly tun...
Conference Paper
Full-text available
A non-equilibrium Langmuir-Knudsen model for multi-component pure diesel and blended diesel/alcohol droplets is developed. This model takes into account most of the key processes during the droplet lifetime, including the finite heat conduction and limited mass diffusion inside the droplet, the differential diffusion in gas phase, and the non-equil...
Conference Paper
Full-text available
In this study, we carried out the thermodynamic analysis for the mixture of CO2/H2O (a multi-component real-fluid system) in the relevant conditions of sCO2 compressor and combustor. We firstly report the recommended the thermal conditions for the recuperater based on the thermal performance of compressor, in order to keep the highest thermal effic...
Article
Full-text available
A fully compressible two-phase flow model consisting of four balance equations including two mass, one momentum, and one internal energy equation, formulated with the mechanical and thermal equilibrium assumptions is developed in this article. This model is closed with a real fluid equation of state (EoS) and has been applied to the simulation of d...
Conference Paper
Full-text available
In this paper, a fully compressible real-fluid and homogeneous equilibrium model (HEM) has been developed, in which the two-phase characteristics are obtained using a tabulated multicomponent vapor-liquid equilibrium approach. This classical HEM model consists of four balance equations posed in terms of mass density, partial species density, moment...
Conference Paper
Full-text available
A non-equilibrium Langmuir-Knudsen model for multi-component pure diesel and blended diesel/alcohol sprays is developed and evaluated through comparisons with experimental measurements. This model takes into account most of the key processes during the droplet lifetime, including the finite heat conduction and limited mass diffusion inside the drop...
Article
Full-text available
A fully compressible four-equation model for multicomponent two-phase flow coupled with a real-fluid phase equilibrium-solver is suggested. It is composed of two mass, one momentum, and one energy balance equations under the mechanical and thermal equilibrium assumptions. The multicomponent characteristics in both liquid and gas phases are consider...
Article
The auto-ignition of isolated lubricating oil droplets in cylinder conditions is one of main causes of abnormal combustion of natural gas engines. The evaporation behavior of less volatile lubricating oil droplets is the key parameter controlling the auto-ignition event. The suspended droplet technique was used and a fully transient multi-component...
Article
A decoupling physical–chemical surrogate (DPCS) model was constructed for simulating the multi-component physical and chemical characteristics of practical diesel fuel. In the DPCS model, the physical and chemical characteristics of diesel fuel are surrogated separately, and the physical and chemical surrogates are coupled according to the principl...
Conference Paper
The distribution of lubricating oil droplets in cylinder is one of main causes of abnormal combustion of natural gas engines. The evaporation of lubricating oil droplet is one of the key sub-processes controlling its auto-ignition event. The components of lubricating oil with different carbon number (16–50) shows significantly different evaporation...
Conference Paper
Full-text available
A fully compressible two-phase flow with four-equation model coupled with a real-fluid multi-component phase equilibrium solver is proposed. It is composed of two mass conservation equations, one momentum equation and one energy equation under the assumptions of mechanical and thermal equilibrium. The phase equilibrium solver is developed based on...
Conference Paper
Full-text available
The aim of this work is to improve the accuracy of cavitating flow simulations by considering real-fuel mixture thermodynamics, like gas (air) solubility and physical property deviations from ideality, and their effects on phase change. In this work, a new fully compressible two-phase six-equations model coupled with Peng and Robinson [1] real-flui...
Article
An analogical multi-component (AMC) vaporization model for diesel droplets was proposed and constructed. First, sensitive properties, which varied with components show significant effects on the vaporization behaviors, were determined, including the liquid density, vapor pressure, enthalpy of vaporization, and gas diffusivity. In the AMC model, the...
Article
An improved multicomponent evaporation model was developed to study the evaporation characteristics of the pure diesel and alcohol (C2–C9) as well as their blended droplets. In this model, the Predictive Soave–Redlich–Kwong (PSRK) equation of state (EOS) was employed to evaluate the vapor–liquid equilibrium for pure and blended droplets. The result...
Article
The auto-ignition of lubricating oil droplets in cylinder has been confirmed to be one of the major reasons of abnormal combustion in natural gas engines. A serial of fundamental experiments were carried out to elucidate the lubricating oil evaporation and pyrolysis behaviors under different ambient temperatures. An enhanced multi-component evapora...
Article
A new quasi-dimensional multi-component vaporization model considering the finite thermal conductivity and mass diffusivity within the droplet was constructed. First, the heat flux of conduction, enthalpy diffusion, and radiation absorption in the gas phase were calculated based on the Fourier’s law, a multi-diffusion sub-model, and a simplified an...
Article
An enhanced multi-component vaporization model was proposed to simulate the vaporization process of fuel droplets under high ambient temperatures and pressures. In the present model, the heat flux of conduction, enthalpy diffusion, and radiation absorption in the gas phase are calculated by Fourier's law, the multi-component diffusion sub-model, an...
Article
An improved multi-component vaporization model was developed and applied to predict the vaporization characteristics of a fuel droplet under oxygen-enriched and exhaust gas recirculation (EGR) conditions in this study. The model was constructed including an improved enthalpy diffusion sub-model, a corrected Stefan flow velocity, and temporal variat...

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Projects (3)
Project
Develop a predictive cavitation model
Project
Develop a cavitation model using the homogeneous equilibrium method and PR EoS.