动力工程学报
動力工程學報
동력공정학보
JOURNAL OF POWER ENGINEERING
2012年
11期
841-846
,共6页
朱幼君%王红涛%竺晓程%杜朝辉
硃幼君%王紅濤%竺曉程%杜朝輝
주유군%왕홍도%축효정%두조휘
汽轮机%排汽缸%排汽损失%压力恢复系数%试验模型%数值计算
汽輪機%排汽缸%排汽損失%壓力恢複繫數%試驗模型%數值計算
기륜궤%배기항%배기손실%압력회복계수%시험모형%수치계산
steam turbine%exhaust hood%exhausting loss%pressure recovery coefficient%test model%numerical calculation
针对汽轮机低压排汽缸气动性能对汽轮机组效率的影响,采用小尺寸试验模型对汽轮机低压排汽缸进行了数值模拟,得到扩压器进口导流环壁面压力分布和出口特征平面速度分布,并与相应的试验测量结果进行了比较,验证了数值计算结果的可靠性.通过数值模拟方法分析了扩压器和蜗壳的性能.结果表明:汽轮机扩压器导流环和蜗壳之间的涡系结构复杂,通道涡是造成排汽缸扩压能力降低和能量损失的主要因素.
針對汽輪機低壓排汽缸氣動性能對汽輪機組效率的影響,採用小呎吋試驗模型對汽輪機低壓排汽缸進行瞭數值模擬,得到擴壓器進口導流環壁麵壓力分佈和齣口特徵平麵速度分佈,併與相應的試驗測量結果進行瞭比較,驗證瞭數值計算結果的可靠性.通過數值模擬方法分析瞭擴壓器和蝸殼的性能.結果錶明:汽輪機擴壓器導流環和蝸殼之間的渦繫結構複雜,通道渦是造成排汽缸擴壓能力降低和能量損失的主要因素.
침대기륜궤저압배기항기동성능대기륜궤조효솔적영향,채용소척촌시험모형대기륜궤저압배기항진행료수치모의,득도확압기진구도류배벽면압력분포화출구특정평면속도분포,병여상응적시험측량결과진행료비교,험증료수치계산결과적가고성.통과수치모의방법분석료확압기화와각적성능.결과표명:기륜궤확압기도류배화와각지간적와계결구복잡,통도와시조성배기항확압능력강저화능량손실적주요인소.
Based on the effects of aerodynamic performance of low-pressure exhaust hood on the steam tur- bine efficiency, numerical simulations were carried out on a small-scale test model of low-pressure exhaust hood to obtain the wall pressure distribution of guide ring at diffuser inlet and the velocity distribution of characteristic plane at diffuser outlet, during which the calculated results were compared and verified with actual measurements. Moreover the performance of diffuser and volute was analyzed by numerical simula- tion method. Results show that the vortex structure is very complicated between the diffuser and volute, and the passage vortex is found to be the main cause leading to the reduced diffusion capacity and energy loss in the exhaust hood.