进汽结构对部分进汽损失的影响研究  

Numerical Investigation on the Influence of Inlet Structure on Partial-admission Losses

作　　者：潘阳 袁奇[1] 朱光宇[1] PAN Yang;YUAN Qi;ZHU Guangyu(Shaanxi Engineering Laboratory of Turbomachinery and Power Equipment（Xi＇an Jiaotong University）,Xi＇an 710049,Shaanxi Province,China)

机构地区：[1]陕西省叶轮机械及动力装备工程实验室(西安交通大学)

出　　处：《中国电机工程学报》2018年第14期4156-4164,共9页Proceedings of the CSEE

基　　金：国家自然科学基金项目(11372234);西安交通大学自然科学基金重点项目(ZRZD2017025)~~

摘　　要：喷管配汽调节级作为汽轮机的主要结构之一,可有效调节汽轮机的功率,其所产生的部分进汽损失组成复杂且造成机组效率的下降。文中采用ANSYS-CFX软件研究了一种小型涡轮的12种单级部分进汽结构在60余种运行工况下的部分进汽损失和效率特性。结果表明：部分进汽工况会给涡轮带来额外损失,且损失随部分进汽度的降低而增加,逐渐降低部分进汽度时,损失增加速率逐步增大,转速的增加能够提升相对内效率;在相同进汽度下,多进汽弧段较单进汽弧段损失更大,但受到弧段周向间距的影响,增加进汽弧段个数并不会明显降低相对内效率;进汽弧段周向间距越大,其造成的部分进汽损失越大,但在一定范围内（g/p=0.5～2.0）,周向间距对效率影响不大。As a main structure of steam turbine, nozzle control stage can effectively regulate the power output. However, it causes extra partial-admission losses and leads to low flow efficiency. The ANSYS-CFX software was used to numerically investigate the partial-admission losses and efficiency characteristics of 12 cases of a small single stage partial-admission turbine under 60 kinds of operation conditions. The results show that partial-admission will cause extra losses and the losses increase as the admission degree decreases. Also it is found that the rate of losses increase is much bigger at low admission conditions than that at high admission conditions. Turbine efficiency increases with the rotational speed. Compared with single-inlet-arc, multipleinlet-arc leads to higher partial-admission losses under the same admission degree. However, increasing the count of the arc cannot significantly increase the turbine efficiency for multiple-inlet-arc turbines due to the effect of circumferential gaps between inlet sectors. Bigger circumferential gap between inlet sectors causes more partial-admission losses. However, within a certain range（g/p=0.5～2.0）, the circumferential gap has little effect on the efficiency.

关 键 词：汽轮机 部分进汽损失 部分进汽度 进汽弧段数 进汽弧段周向间距 

分 类 号：TK261[动力工程及工程热物理—动力机械及工程]