高温环境辅助进气合成射流的激励器性能

Performace of novel synthetic jet actuator under high ambient temperature

对高温环境下活塞式合成射流激励器的流场进行了数值模拟和试验研究,对比了激励器工作频率和射流孔直径,对常规、辅助进气激励器性能的影响。结果表明:在高温环境下,相对于常规进气,辅助进气可以显著地提高激励器性能,激励器吸气量、腔体峰值压比和射流峰值动量提高的同时,激励器出口截面射流峰值速度略有下降。辅助进气装置的效能最大区域为高工作频率或者小射流孔直径。相对于常规激励器,辅助进气激励器的吸气量、腔体峰值压比和射流峰值动量的增加幅度最大,分别增加了常规激励器的230.73%、103.97%和107.37%(工作频率为250Hz,射流孔直径为2mm)。

The flow field of the piston-type synthetic jet actuator(SJA)under high ambient temperature was investigated numerically and experimentally.The effects of the actuation frequency and orifice diameter on conventional SJA and novel SJA were analyzed.The results indicated that the auxiliary air inlet can significantly increase the SJA performance under high ambient temperature.Compared with the conventional SJA,the novel SJA can increase the inlet mass flow rate,peak cylinder pressure ratio and peak jet momentum,despite of a little decrease of the peak jet velocity.The peak efficiency of the auxiliary air inlet lied in high actuation frequencies or small orifice diameter.Compared with the conventional SJA,the inlet mass flow rate,peak cylinder pressure ratio and peak jet momentum of novel SJA increased up to 230.73%,103.97%,and 107.37%,respectively,of conventional SJA at actuation frequency of 250 Hz,orifice diameter of 2 mm.