高温防护涂层对燃气舵瞬态绕流场影响的模拟研究

Simulation Study on Transient Circumferential Flow Field of Gas Vane with Plasma-Sprayed High-Temperature Protective Coatings

采用流体计算软件Fluent研究了等离子体喷涂不同厚度的Zr O2涂层和W涂层对燃气舵瞬态绕流压力场和速度场的影响。结果表明,燃气舵前缘为激波最强烈位置,此处压力值达到最大,但速度值降至最低。燃气流受燃气舵形状的扰动在其前缘边缘和后缘处形成膨胀波,压力大幅突降,速度显著增大。为了提高燃气舵抵抗激波能力,需增加Zr O2涂层和W涂层厚度,但膨胀波强度有所增强。计算结果对探究添加等离子体喷涂涂层后燃气舵的防护有一定意义。

The effect of different thickness combinations of Zr O2 coating and W coating on the transient circumferential flow pressure and velocity of gas vane are investigated by computational fluid dynamics（ CFD） numerical simulation software Fluent. The results show that the strongest shock wave happened at the leading edge of gas vane,where pressure achieves the highest,but velocity is the lowest. Gas flow is disturbed by the shape of gas vane,which makes dilatation wave appear at both sides of the leading edge and training edge,where pressure decreases abruptly,but velocity increases remarkable. While wall effect caused by the increasing thickness of Zr O2 coating and W coating,which improves the resistance ability of gas vane to shock wave,but the strength of dilatation wave is enhanced. The results have certain significance to explore the protection of gas vane with plasma sprayed coatings.