摘要
为提高FSAE(Formula SAE)赛车的性能,对其发动机进排气系统进行数值仿真,获得优化设计方案。利用FLUENT对限流阀流场进行计算,得到流量损失最小的入口和出口锥角。运用GT-Power软件建立发动机仿真分析模型,通过实测外特性曲线比对验证模型的准确性;以发动机进排气系统结构尺寸作为单一变量,分析发动机进排气歧管几何参数对发动机动力性能的影响规律,根据所得参数提出优化设计方案。通过对比分析可知优化后发动机的功率、最大扭矩均有较大的提升,同时峰值扭矩的输出转速区域加宽,输出更加平稳,最大扭矩增加11.6%。另外,峰值功率对应的转速点向高转速移动,弥补了安装进气限流阀对发动机动力性能下降的影响,达到了设计要求。
To improve the performance of FSAE (Formula SAE) racing car,numerical simulation of the air inlet and exhaust system of its engine was conducted to obtain optimal design. FLUENT was applied to calculate the flow of limiting valve for the optimum inlet and outlet angle. GT-Power software was applied to build simulation model which was verified by comparing to the measured full load performance;The structural dimensions of engine’s intake and exhaust system were selected as the only variables, and influence of engine inlet and exhaust manifold length and the volume of the pressure stabilizing cavity on the performance of engine power was explored to obtain optimal parameters for structural design. After comparison and analysis, engine power and torque are both improved based on the optimal design, the maximum torque is improved by 11.6%. Meanwhile, peak torque speed range is widened, which lead to more smoothly output. Moreover, the speed of the peak power is shifted to higher speed, which compensates the installation of air intake flow-limiting valve impact on the performance of engine power, meeting the design requirements.
作者
芮宏斌
张帅帅
史洋鹏
蔡斌
郑文哲
Rui Hongbin;Zhang Shuaishuai;Shi Yangpeng;Cai Bin;Zheng Wenzhe(Faculty of Mechanical and Precision Instrument Engineering,Xi'an University of Technology,Xi'an 710048)
出处
《汽车文摘》
2019年第10期34-39,共6页
Automotive Digest
基金
国家级大学生创新创业训练计划项目（201710700030）和（201710700042）
重大科技创新专项资金项目计划（2018ZKC-160）
关键词
FSAE
发动机进排气系统
仿真
优化
FSAE
Engine intake and exhaust system
Simulation
Optimization
