Influence of Piston Initial State on HCCI Combustion in Micro Free-Piston Engine Using Experiment Images and CFD Analysis

2013 ◽  
Vol 724-725 ◽  
pp. 1350-1354
Author(s):  
Jin Bai ◽  
Qian Wang ◽  
Zhi Xia He ◽  
Peng Gang Zhang
Keyword(s):  
High Speed ◽  
Ignition Time ◽  
Combustion Process ◽  
Single Shot ◽  
Piston Engine ◽  
Initial State ◽  
Propane Combustion ◽  
Free Piston ◽  
Hcci Combustion ◽  
Free Piston Engine

The visualization experimental setup of micro free-piston engine has been built, the process of single shot compression combustion in micro combustion chamber has been observed by the high-speed digital camera; Based on the propane combustion kinetics, the numerical calculation method for combustion process coupling with the free-piston movement was put forward, through editing the dynamic mesh subroutine in STAR-CD, the process of homogeneous charge compression ignition (HCCI) in the micro chamber was studied; The influence of piston initial state on HCCI combustion process was analyzed , indicating that the piston mass directly affects the homogeneous gas compression ratio, ignition time, single combustion process cycle and the changes of combustion pressure and temperature, all this research can be the basic theories for designing the micro free piston engine .

scholarly journals Research on the Operating Characteristics of Hydraulic Free-Piston Engines: A Systematic Review and Meta-Analysis

Energies ◽  
2021 ◽  
Vol 14 (12) ◽  
pp. 3530
Author(s):  
Fukang Ma ◽  
Shuanlu Zhang ◽  
Zhenfeng Zhao ◽  
Yifang Wang
Keyword(s):  
Systematic Review ◽  
High Efficiency ◽  
Meta Analysis ◽  
Combustion Process ◽  
Research Progress ◽  
Future Research ◽  
Operating Characteristics ◽  
Piston Engine ◽  
Free Piston ◽  
Free Piston Engine

The hydraulic free-piston engine (HFPE) is a kind of hybrid-powered machine which combines the reciprocating piston-type internal combustion engine and the plunger pump as a whole. In recent years, the HFPE has been investigated by a number of research groups worldwide due to its potential advantages of high efficiency, energy savings, reduced emissions and multi-fuel operation. Therefore, our study aimed to assess the operating characteristics, core questions and research progress of HFPEs via a systematic review and meta-analysis. We included operational control, starting characteristics, misfire characteristics, in-cylinder working processes and operating stability. We conducted the literature search using electronic databases. The research on HFPEs has mainly concentrated on four kinds of free-piston engine, according to piston arrangement form: single piston, dual pistons, opposed pistons and four-cylinder complex configuration. HFPE research in China is mainly conducted in Zhejiang University, Tianjin University, Jilin University and the Beijing Institute of Technology. In addition, in China, research has mainly focused on the in-cylinder combustion process while a piston is free by considering in-cylinder combustion machinery and piston dynamics. Regarding future research, it is very important that we solve the instabilities brought about by chance fluctuations in the combustion process, which will involve the hydraulic system’s efficiency, the cyclical variation, the method of predicting instability and the recovery after instability.

CFD-Based Optimization of a Diesel-fueled Free Piston Engine Prototype for Conventional and HCCI Combustion

2008 ◽  
Vol 1 (1) ◽  
pp. 1118-1143 ◽  
Author(s):  
Miriam Bergman ◽  
Jakob Fredriksson ◽  
Valeri I. Golovitchev
Keyword(s):  
Piston Engine ◽  
Free Piston ◽  
Hcci Combustion ◽  
Free Piston Engine

Numerical analysis of two-stroke free piston engine operating on HCCI combustion

2011 ◽  
Vol 88 (11) ◽  
pp. 3712-3725 ◽  
Author(s):  
Shuaiqing Xu ◽  
Yang Wang ◽  
Tao Zhu ◽  
Tao Xu ◽  
Chengjun Tao
Keyword(s):  
Numerical Analysis ◽  
Piston Engine ◽  
Free Piston ◽  
Hcci Combustion ◽  
Free Piston Engine

Multi-Dimensional Analysis of NOx and Soot Formation in a Diesel-Fueled Hydraulic Free Piston Engine

2013 ◽  
Vol 690-693 ◽  
pp. 2800-2804
Author(s):  
Ying Xiao Yu ◽  
Zhao Cheng Yuan ◽  
Jia Yi Ma ◽  
Shi Yu Li
Keyword(s):  
Mass Fraction ◽  
Soot Formation ◽  
Combustion Process ◽  
Injection Timing ◽  
Swirl Ratio ◽  
Piston Engine ◽  
Free Piston ◽  
Free Piston Engine ◽  
Minor Influence ◽  
A Minor

This paper is aimed at simulating and analyzing emission NOxand Soot formation in the hydraulic free piston engine (HFPE) designed and constructed by Jilin University. The combustion process of HFPE is simulated by using the commercial CFD software AVL FIRE, and the flow field and factors that influence NOxand Soot formation were analyzed. The simulated results indicate that NO is mainly distributed in the burned zone, whereas the distribution of Soot acts in accord with high unburnt equivalence ratio and high temperature burned zone. Injection timing increases, the amount of the formation of NO is reduced, whereas the mass fraction of Soot rises to a peak and descends. And small swirl ratio exerts a minor influence on emission mass fraction of HFPE.

Experimental investigation of the cycle-to-cycle variations in combustion process of a hydraulic free-piston engine

Energy ◽  
2014 ◽  
Vol 78 ◽  
pp. 257-265 ◽  
Author(s):  
Zhenfeng Zhao ◽  
Dan Wu ◽  
Zhenyu Zhang ◽  
Fujun Zhang ◽  
Changlu Zhao
Keyword(s):  
Experimental Investigation ◽  
Combustion Process ◽  
Piston Engine ◽  
Free Piston ◽  
Free Piston Engine

scholarly journals Effects of five different parameters on biodiesel HCCI combustion in free-piston engine generator

2021 ◽  
Vol 25 (6 Part A) ◽  
pp. 4197-4207
Author(s):  
Chunhui Liu ◽  
Shaojie Wu ◽  
Shuo Pang
Keyword(s):  
Initial Pressure ◽  
Piston Engine ◽  
Detailed Chemical Kinetics ◽  
Free Piston ◽  
Hcci Combustion ◽  
Free Piston Engine ◽  
Combustion Simulation ◽  
Working Frequency ◽  
Skeletal Mechanism ◽  
Detailed Chemical

A coupled 3-D CFD and detailed chemical kinetics model of free-piston engine generator (FPEG) was adopted to investigate the effects of initial parameters on homogeneous charge compression ignition (HCCI) combustion and emission. Biodiesel with 115 species skeletal mechanism was selected as fuel. Five different parameters, namely the initial pressure, the initial temperature, the working frequency, the compression ratio and the fuel equivalence ratio, were selected to analyze their influences in the HCCI combustion simulation of FPEG. The simulation results showed that the change of the five parameters had visible impact on the heat release rate of HCCI combustion, which caused the in-cylinder temperature and pressure to change, and also caused the emission content of NOx and SOOT to change obviously.

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