摘要
通过进一步构建微型摆式发动机计算模型,深入探究了传热与尺度效应对微型摆式发动机性能的影响作用。结果表明,壳体单纯在比较薄的热缓存层内部和工质气体之间相互进行热交换,且具有一定的周期性。其中,在进气时,热缓存层对气体传热,会在一定程度上提高气体温度,导致进气质量与压缩比明显下降。在做功时,气体对热缓存层的传热适当缩减做功,则会直接降低系统热效率。而尺寸越小,在热缓存层传热下,进气气体的温度上升会越来越大,进气质量与压缩比也会随之进一步降低。在做功时,气体为热缓存层所传热量在燃气总化学性能中所占比值不断提高。所以,尺寸不断缩小,传热效应随之强化,热效率却越来越低。
In this paper,the effect of heat transfer and scale effect on the performance of micro pendulum engine is studied by constructing the calculation model of micro pendulum engine.The results show that the shell is heat exchanged between the thin thermal buffer layer and the working gas and has a certain periodicity.The heat transfer in the thermal buffer layer increases the temperature of the gas to some extent and results in the decrease of the air intake mass and compression ratio.When the work is done,the heat transfer of the thermal buffer layer is re?duced properly,and the thermal efficiency of the system is directly reduced.The smaller the size is,the larger the temperature of inlet gas will be,and the lower the mass and compression ratio of intake gas will be under the heat transfer in the thermal buffer layer.When the work is done,the ratio of heat transfer rate of gas to thermal buffer layer in the total chemical performance of gas is increasing.As a result,the heat transfer effect intensifies while the thermal efficiency becomes lower and lower.
作者
王瑜
WANG Yu(College of Aeronautical Manufacturing Engineering,Xi’an Aeronautical Polytechnic Institute,Xi’an 710089,China)
出处
《工业加热》
CAS
2019年第4期5-8,共4页
Industrial Heating
关键词
微型摆式发动机
性能
传热
影响作用
micro pendulum engine
function
conduct heat
influence effect
