汽车工程师
汽車工程師
기차공정사
TIANJIN AUTO
2011年
7期
42-45
,共4页
汽油机%进气道%数值模拟%流量系数
汽油機%進氣道%數值模擬%流量繫數
기유궤%진기도%수치모의%류량계수
Gasoline engine%Intake port%Numerical simulation%Flow coefficient
通过模拟计算可以在较短的时间内获得关于气缸内气体流动的详细信息,为进一步分析气道内流场及各种参数提供参考,降低新产品开发和试验周期。文章利用Fluent软件对二气门汽油机进气道的气流运动进行了三维数值模拟计算和试验分析,结果表明发动机缸内的滚流很弱,在进气门下方形成一个＂混合死角＂,不利于油气的混合,流量系数的模拟值与试验结果较接近。指出CFD技术在发动机气道气体流动的模拟中具有较高精度,可为分析气道内流场的分布及气道的改进提供可靠依据。
通過模擬計算可以在較短的時間內穫得關于氣缸內氣體流動的詳細信息,為進一步分析氣道內流場及各種參數提供參攷,降低新產品開髮和試驗週期。文章利用Fluent軟件對二氣門汽油機進氣道的氣流運動進行瞭三維數值模擬計算和試驗分析,結果錶明髮動機缸內的滾流很弱,在進氣門下方形成一箇＂混閤死角＂,不利于油氣的混閤,流量繫數的模擬值與試驗結果較接近。指齣CFD技術在髮動機氣道氣體流動的模擬中具有較高精度,可為分析氣道內流場的分佈及氣道的改進提供可靠依據。
통과모의계산가이재교단적시간내획득관우기항내기체류동적상세신식,위진일보분석기도내류장급각충삼수제공삼고,강저신산품개발화시험주기。문장이용Fluent연건대이기문기유궤진기도적기류운동진행료삼유수치모의계산화시험분석,결과표명발동궤항내적곤류흔약,재진기문하방형성일개＂혼합사각＂,불리우유기적혼합,류량계수적모의치여시험결과교접근。지출CFD기술재발동궤기도기체류동적모의중구유교고정도,가위분석기도내류장적분포급기도적개진제공가고의거。
Through simulation calculation,detailed information of air flow in cylinder can be obtained within a shorter period of time.It provides reliable basis for further analysis of various parameters of airway flow field and it will shorten the new product development and test cycle.The three-dimensional numerical simulation and test analysis of air flow in an intake port of a two-valve gasoline engine was performed with Fluent software.The results show that tumble motion of the cylinder is very small and below the intake valve a ＇dead zone of air-fuel for mixing＇ is formed,which is not good for air-fuel mixing.The simulation value of flow coefficient is close to the test results.It is indicated that CFD technology has high precision in the simulation of air flow in the intake port of engine,providing theoretical foundations for the distribution of flow flied in cylinder and improvement of engine port design.
