Study on the Effect of Organic Mixed Working Medium on the Characteristics of Engine Inlet Cooling Flow Field
In order to solve the problem of high compressor inlet temperature under high Mach number,a coupling model of gas-liquid two-phase flow was established,and ethanol and ethylene glycol with dif-ferent mass fractions were used as cooling working fluids for numerical simulation,and the effects of or-ganic working medium mass fraction and type on heat exchange effect,evaporation characteristics and re-sistance loss in flow field of precooling section were explored.The results show that both the evaporation rate and evaporation amount increase with the increase of the mass fraction of organic working medium,in which ethanol solution has a best effect,when the mass fraction is increased from 10%to 50%,the e-vaporation effect is increased by about 20%,and the change of mass fraction has no influence on the liq-uid-gas ratio.The lower the mass fraction of organic matter,the better the temperature drop effect of the flow field,and the difference depends on the liquid-gas ratio.When the liquid-gas ratio is 3.3%,the difference between the temperature drop of ethanol solution and glycol solution between 10%and 50%mass fractions are 3.15 K and 3.46 K.The pressure drop loss of flow field is affected by many factors,and it is not a single linear relationship.With the increase of liquid-gas ratio,organic working medium with high mass fraction can reduce the pressure loss,but it is opposite under the condition of slightly low-er intake speed.The outlet uniformity of the flow field is positively correlated with the mass fraction of the solution,and the evaporative working medium such as ethanol has a greater influence on the uniformity.
organic working mediumspray coolingevaporationtotal pressure loss
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