换热管内液轮机的转速计算  

Rotating Speed Calculation for Hydraulic Turbine Inside Heat Exchanger Tubes

作　　者：林靖宇[1] 林清宇[2] 林榕端[2] 

机构地区：[1]广西大学电气工程学院,南宁530004 [2]广西大学化学化工学院,南宁530004

出　　处：《机械工程学报》2008年第11期105-111,共7页Journal of Mechanical Engineering

基　　金：国家自然科学基金(29966001);广西省科学基金(桂科青0447005)资助项目。

摘　　要：进行换热管内液轮机转子内流体运动分析,根据动量矩定理求得液流给液轮机的转动力矩及液轮机所受阻力矩,在定态流动时液轮机恒速转动,转动力矩与阻力矩应平衡,由此推导出液轮机的转速计算式。进行15种不同参数液轮机的转速特性试验,试验结果与理论表达式比较一致。理论分析及试验结果均表明,影响换热管内液轮机转速的主要因素是流体轴向流速及叶片螺距。流体轴向流速越大,液轮机转速越高,两者呈线性关系;叶片螺距越大,液轮机转速越低。提出表征换热管内液轮机特征的无因次准数,无因次准数关联了液轮机转速及影响转速的两个主要参数——流体轴向流速和叶片螺距。The fluid flow of hydraulic turbine inserted heat exchanger is analyzed, According to the moment of momentum theorem, the rotational moment M and the resistant moment Mf of hydraulic turbine are obtained. M equals Mf while the hydraulic turbine rotates with constant speed by permanent flow. As a result, the rotational speed expression of hydraulic turbine is educed. The rotational performance of fifteen hydraulic turbines with different size is studied by experiments, and the result of the experiment is consistent with the theoretical expression. All the results show that the axial velocity vz of the flow and the thread pitch H of the vane are the main influencing factors in the rotational speed n of the hydraulic turbine. The greater the axial velocity is, the higher the rotational speed will be; the greater the thread pitch is, the lower the rotational speed will be. Besides, the dimensionless coefficient Rd, i.e. a token of hydraulic turbine, is put forward. Rd relates n, vz and H.

关 键 词：换热管 液轮机 转速 

分 类 号：TQ050[化学工程] TK172[动力工程及工程热物理—热能工程]