平移距离和燃烧室半径对小型椭圆转子发动机燃烧过程的影响  

Influence of translation distance and combustion chamber radius on combustion process of a small elliptical rotary engine

作　　者：么大锁 秦静[1,3] 裴毅强[1] 王膺博 张岩[4] YAO Dasuo;QIN Jing;PEI Yiqiang;WANG Yingbo;ZHANG Yan(State Key Laboratory of Advanced Internal Combustion Power,Tianjin University,Tianjin 300072,China;School of Mechanical Engineering,Tianjin Ren'ai College,Tianjin 301636,China;Internal Combustion Engine Research Institute,Tianjin University,Tianjin 300072,China;Key Laboratory of Diesel Engine Turbocharging,China North Engine Research Institute,Tianjin 300400,China)

机构地区：[1]天津大学先进内燃动力全国重点实验室,天津300072 [2]天津仁爱学院机械工程学院,天津301636 [3]天津大学内燃机研究所,天津300072 [4]中国北方发动机研究所柴油机增压技术重点实验室,天津300400

出　　处：《中南大学学报(自然科学版)》2025年第1期334-346,共13页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(52276131);柴油机增压技术重点实验室基金资助项目(6142212210411)。

摘　　要：针对小型椭圆转子发动机燃烧不充分的问题,运用数值模拟方法,研究了平移距离和燃烧室半径对小型椭圆转子发动机缸内流场、湍动能、燃烧过程的影响。研究结果表明:小型椭圆转子发动机缸内湍动能和流场受平移距离、燃烧室半径、燃烧速度的共同影响,在不同阶段,起主导作用的因素各不相同。在进气初期,平移距离起主导作用;在进气中期,燃烧室半径起主导作用;在燃烧阶段,燃烧速度起主导作用;减小平移距离、增大燃烧室半径,可以提高燃烧速度,增加缸内的湍动能,使火焰传播距离更远,有利于解决在燃烧室两侧狭缝中燃烧不完全的问题;减小平移距离、增大燃烧室半径,可以使更多的燃料在球形燃烧室内燃烧,从而提高燃料利用率、增大放热量、减少碳氢排放;减小平移距离、增大燃烧室半径,可以显著提高燃烧阶段缸内的温度和压力,指示热效率和指示功均大幅提高。当平移距离为0.3 mm时,小型椭圆转子发动机指示热效率和指示功分别为24.48%和14.94 J,与平移距离为0.9 mm时相比,指示热效率和指示功分别提高了58.0%和51.4%。本研究为小型椭圆转子发动机的性能改进和优化设计提供了理论基础与技术支撑。In order to slove the problem of insufficient combustion of a small elliptical rotary engine,the influence of translation distance and combustion chamber radius on the flow field,turbulent kinetic energy and combustion process of a small elliptical rotary engine was studied by numerical simulation.The results show that,turbulent kinetic energy and flow field of the small elliptical rotary engine are affected by translation distance,combustion chamber radius,and combustion speed,and the leading factor is different in different stages.The translation distance plays a leading role in the initial stage of intake,the combustion chamber radius plays a leading role in the middle stage of intake,and the combustion speed plays a leading role in the combustion stage.Reducing the translation distance and increasing the radius of the combustion chamber can increase the combustion speed,increase the turbulent kinetic energy in the cylinder,and make the flame spread farther,which is conducive to solving the problem of incomplete combustion in the slit on both sides of the combustion chamber.Reducing the translation distance and increasing the radius of the combustion chamber can make more fuel burn in the spherical combustion chamber,so as to improve the fuel utilization rate,increase the heat release,and reduce HC emission.Reducing the translation distance and increasing the radius of the combustion chamber can significantly increase the temperature and pressure in the combustion stage,and indicated thermal efficiency and indicated work are greatly improved.When the translation distance is 0.3 mm,the indicated thermal efficiency and indicated work of the small elliptical rotary engine are 24.48% and 14.94 J,respectively.Compared with the translation distance of 0.9 mm,the indicated thermal efficiency and indicated work are increased by 58.0% and 51.4%,respectively.This research provides theoretical basis and technical support for performance improvement and optimization design of the small elliptical rotary engine.

关 键 词：椭圆转子发动机 平移距离 燃烧室半径 燃烧过程 燃烧速度 

分 类 号：TK45[动力工程及工程热物理—动力机械及工程]