The sealing of the rotor-rotor gap and rotor disk cooling are vital to the safe operation of the vaneless counter-rotating turbine(VCRT). In order to quantifies the influence of the wheel-space cavity flow on the VCRT aerodynamic performance, and to improve turbine efficiency of the VCRT at certain rim seal ejection rates, numerical studies which considered the effects of rotor-rotor rim seal flow ejection are carried out in this paper. The three dimensional unsteady computational fluid dynamic analysis of a VCRT at the engine conditions are performed, and the seal flow ejected downstream of the high pressure rotor row at six sealing flow rate are modeled. The interaction among the high pressure rotor trailing shock wave, the downstream secondary flow and the seal flow has been studied and quantitatively characterized as a function of the purge ejection rate. Numerical results show that seal flow- mainstream flow interaction is entirely dominated by the high pressure rotor trailing edge shock at the hub, low pressure hub passage vortex and the mixing of the sealing flow from wheelspace and mainstream. When the mass flow rate of the coolant is smaller than some threshold value, the shock loss of the high pressure rotor and hub secondary flow loss of the low pressure rotor are decreased with the increasing of the coolant mass flow rate. It causes that the VCRT efficiency is gradually increased. On condition that the amount of the seal flows is beyond the threshold value, the key roles in modification of the VCRT performance are changed. The increment of the hub secondary flow loss and the mixing loss are gradually larger than the decrement of the shock loss. As a result, the turbine efficiency gradually decreases.

转子-转子间隙的密封和转子盘的冷却对于无叶片反向旋转涡轮机（VCRT）的安全运行至关重要。为了量化叶轮腔腔流动对VCRT空气动力性能的影响，并在一定的轮辋密封件喷射速率下提高VCRT的涡轮效率，进行了考虑转子-转子轮辋密封件流体喷射影响的数值研究。在本文中。在发动机工况下对VCRT进行了三维非定常计算流体动力学分析，并对以六种密封流量喷射到高压转子排下游的密封流进行了建模。高压转子尾随冲击波之间的相互作用，已经研究了下游的二次流和密封流，并将其定量地表征为吹扫喷射速率的函数。数值结果表明，密封流与主流之间的相互作用完全由毂上的高压转子后缘冲击，低压毂通道涡流以及来自轮距和主流的密封流的混合所主导。当冷却剂的质量流率小于某个阈值时，随着冷却剂质量流率的增加，高压转子的冲击损失和低压转子的轮毂二次流损失减小。这导致VCRT效率逐渐提高。在密封流量超过阈值的条件下，更改VCRT性能的关键作用将改变。轮毂二次流损失和混合损失的增加量逐渐大于冲击损失的减少量。结果，涡轮效率逐渐降低。