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- 2018
不同燃料自由喷雾及喷雾撞壁特性试验研究
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Abstract:
运用相位多普勒(phase Doppler anemometry, PDA)系统对甲醇、乙醇、异辛烷、甲苯参比燃料(toluene reference fuels, TRF)和汽油5种燃料缸内直喷(gasoline direct injection, GDI)喷油器喷雾撞壁后的粒径粒速进行了全面的试验研究．结果表明：与汽油相比, 甲醇、乙醇和TRF燃料自由喷雾的液滴速度更小, 而液滴粒径更大．与自由喷雾相比, 喷雾撞壁的入射液滴粒径较大, 反弹液滴粒径较小; 入射液滴的法向速度变小, 喷雾撞壁后反弹液滴的法向速度变小, 且不同燃料之间反弹液滴法向速度的差别变小．具有较大入射液滴直径和较高K值的乙醇和异辛烷燃料中, 乙醇喷雾撞壁后反弹液滴的粒径()小于异辛烷喷雾撞壁后的, 其破碎效果好于异辛烷的, Mundo的模型需做修改．不同燃料喷雾撞壁后的反弹角度均在0°～90°范围内变化, 而不是Stanton和Mundo模型中的65°～90°, 因此模型中反弹角度的变化范围应增大至0°～90°．
The size and velocity of droplets of impingement spray fueled with methanol，ethanol，isooctane，toluene reference fuels(TRF)and gasoline were investigated by using phase Doppler anemometry(PDA)system with a gasoline direct injection injector. Results show that the velocity of droplets is slower and the size of droplets is bigger in free spray fueled with methanol，ethanol and TRF，compared with those of gasoline fuel. Incident droplets are bigger and reflected droplets are smaller compared with those of free spray. The normal velocity of incident droplets and reflected droplets is smaller than that of free spray. The difference in normal velocity of reflected droplets between five different fuels is smaller. The diameters of ethanol fuel are smaller and the crushing effect is better than that of isooctane fuel after impinging wall，since both ethanol and isooctane fuels have larger incident droplets and higher K values. The model of Mundo needs to be modified. The reflected angles of droplets with five different fuels range from 0° to 90° after impinging the wall，rather than 65° to 90° described in the models of Stanton and Mundo. Therefore，the range of reflected angles in the models of Stanton and Mundo should be increased to 0°―90°
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