导弹与航天运载技术
導彈與航天運載技術
도탄여항천운재기술
MISSILES AND SPACE VEHICLES
2015年
1期
17-21
,共5页
超声速冲击式涡轮%密封%密封间隙
超聲速遲擊式渦輪%密封%密封間隙
초성속충격식와륜%밀봉%밀봉간극
Supersonic impulse turbine%Seal%Seal clearance
短叶片冲击式涡轮采用带冠结构以减小动叶顶部间隙的泄漏，同时为了减小围带与涡轮外壳间隙泄漏，在叶冠围带处增加密封结构。密封内部流动比较复杂，对涡轮性能影响较大。通过对某超声速涡轮进行的三维模拟，对比不考虑间隙涡轮与考虑密封间隙涡轮（不同密封间隙）整体性能，分析密封间隙对涡轮内部流动的影响。
短葉片遲擊式渦輪採用帶冠結構以減小動葉頂部間隙的洩漏，同時為瞭減小圍帶與渦輪外殼間隙洩漏，在葉冠圍帶處增加密封結構。密封內部流動比較複雜，對渦輪性能影響較大。通過對某超聲速渦輪進行的三維模擬，對比不攷慮間隙渦輪與攷慮密封間隙渦輪（不同密封間隙）整體性能，分析密封間隙對渦輪內部流動的影響。
단협편충격식와륜채용대관결구이감소동협정부간극적설루，동시위료감소위대여와륜외각간극설루，재협관위대처증가밀봉결구。밀봉내부류동비교복잡，대와륜성능영향교대。통과대모초성속와륜진행적삼유모의，대비불고필간극와륜여고필밀봉간극와륜（불동밀봉간극）정체성능，분석밀봉간극대와륜내부류동적영향。
Crown structure is applied widely to the short-blade impulse turbine to reduce leakage from the top of the rotor and seals structure is fortified to reduce leakage from the clearance of the crown structure.The flow inside the seals is complicated and has great influence on turbine’s performance.Three-dimensional simulation of some supersonic turbine is conducted. The performances of the turbines with and without seals(with various clearance)are compared and the influence of seal clearance on the flow field inside the turbine is analyzed.
