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自主设计一套能够为喷嘴提供稳定背压环境的实验台架和数据采集测量系统,并对某型号压力喷嘴进行背压环境下的雾化特性实验研究。本研究运用微小流量计测量喷嘴流量,经计算得到实验喷嘴的流量系数。雾化锥角随背压的增加而减小,最终趋于稳定值。粒径变化规律为:在距离喷口较近处,相同压差条件下雾化粒径随背压的增大而减小(约20%);距离喷嘴较远时,背压越大雾化粒径越大,增幅为10%~20%。在背压低于0.3 MPa时,同一高度处不同压差下雾化粒径大小差别明显;在背压达到0.4 MPa时,实验压差对雾化粒径无显著影响,粒径大小变化小于5%。
A set of experimental bench and data acquisition and measurement system that can provide a stable backpressure environment for the nozzle are designed independently. Experimental research on the atomization characteristics of a pressure nozzle under back pressure is carried out. In this study, a small flowmeter was used to measure the nozzle flow rate. The flow coefficient of the experimental nozzle was calculated. The atomization cone angle decreases with the increase of backpressure and finally tends to a stable value. The variation of particle size is as follows: the atomization particle size decreases with the increase of backpressure (about 20%) under the same pressure difference when it is close to the nozzle; Larger diameter, an increase of 10% to 20%. When the back pressure is lower than 0.3 MPa, the difference of atomization particle size is obvious under different pressure difference at the same height. When the back pressure reaches 0.4 MPa, the experimental pressure difference has no significant effect on atomization particle size, and the change of particle size is less than 5% .