西华大学学报（自然科学版）
西華大學學報（自然科學版）
서화대학학보（자연과학판）
JOURNAL OF XIHUA UNIVERSITY(NATURAL SCIENCE EDITION)
2015年
1期
55-60
,共6页
液力透平%蜗壳%水力损失%速度矩
液力透平%蝸殼%水力損失%速度矩
액력투평%와각%수력손실%속도구
hydraulic turbine%volute%hydraulic loss%velocity torque
为减小液力透平各过流部件的水力损失,提高液力透平的效率,在不同蜗壳进口截面下将一单级液力透平蜗壳的基圆作为一环线,计算沿该环线的切向速度值,根据基圆半径计算出相应的速度矩,并在环线上分别设置4个监测点,利用ANSYS软件计算监测点处的速度矩随流量的变化规律,最后研究蜗壳进口截面对各过流部件水力损失的影响。结果表明：所选液力透平的蜗壳最佳进口直径为65 mm,改进后液力透平的效率比原设计下的效率提高了1．83%,且在该蜗壳进口下叶轮进口的速度矩波动幅值最小；随着蜗壳进口直径的增加叶轮进口的速度矩逐渐减小,蜗壳收缩管的收缩率逐渐增加,收缩管中的水力损失逐渐减小。
為減小液力透平各過流部件的水力損失,提高液力透平的效率,在不同蝸殼進口截麵下將一單級液力透平蝸殼的基圓作為一環線,計算沿該環線的切嚮速度值,根據基圓半徑計算齣相應的速度矩,併在環線上分彆設置4箇鑑測點,利用ANSYS軟件計算鑑測點處的速度矩隨流量的變化規律,最後研究蝸殼進口截麵對各過流部件水力損失的影響。結果錶明：所選液力透平的蝸殼最佳進口直徑為65 mm,改進後液力透平的效率比原設計下的效率提高瞭1．83%,且在該蝸殼進口下葉輪進口的速度矩波動幅值最小；隨著蝸殼進口直徑的增加葉輪進口的速度矩逐漸減小,蝸殼收縮管的收縮率逐漸增加,收縮管中的水力損失逐漸減小。
위감소액력투평각과류부건적수력손실,제고액력투평적효솔,재불동와각진구절면하장일단급액력투평와각적기원작위일배선,계산연해배선적절향속도치,근거기원반경계산출상응적속도구,병재배선상분별설치4개감측점,이용ANSYS연건계산감측점처적속도구수류량적변화규률,최후연구와각진구절면대각과류부건수력손실적영향。결과표명：소선액력투평적와각최가진구직경위65 mm,개진후액력투평적효솔비원설계하적효솔제고료1．83%,차재해와각진구하협륜진구적속도구파동폭치최소；수착와각진구직경적증가협륜진구적속도구축점감소,와각수축관적수축솔축점증가,수축관중적수력손실축점감소。
The diffusion tube of volute outlet becomes the shrinkable tube of hydraulic turbine when centrifugal pump acts as hy-draulic turbine. The energy loss between the diffusion tube and shrinkable tube is different, as well as the effect of the shrinkable tube of different shrinkage rate on hydraulic loss and velocity torque of hydraulic turbine. In order to reduce hydraulic loss of each the flow components in hydraulic turbine and improve the efficiency of hydraulic turbine, the base circle of volute of a single stage hydraulic tur-bine is regarded as a loop line under the different entrance section. The tangential velocity along the loop line is calculated. Corre-spondingly, the velocity torque is work out with the radius of base circle. Four monitoring points in the loop are set up. At the points, the velocity torque varies with the flow rate. The varieties are analyzed with ANSYS software and effect of the entrance section of volute on hydraulic loss of each the flow components is studied. The results show that the optimum entrance diameter of volute of hydraulic turbine is equal to 65 mm. Compared to the original design, the efficiency of improved hydraulic turbine increases by 1. 83%. Fluctu-ant amplitude of velocity torque of impeller entrance is minimum in the volute entrance. With increasing volute entrance diameter, ve-locity torque of impeller entrance and the hydraulic loss is gradually decreased. Meanwhile the shrinkage rate of shrinkable tube in vo-lute gradually increases.
