多喷嘴冲击式水轮机内部流动研究

来源 :农业机械学报 | 被引量 : 0次 | 上传用户:kpku88
下载到本地 , 更方便阅读
声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架
论文部分内容阅读
为了提高冲击式水轮机的出力与比转数,在设计时往往采取增加喷嘴数,但喷嘴数的增加会引起转轮内部流动的相互干涉,降低机组效率。本文采用CFD技术对六喷嘴冲击式水轮机转轮内部流动进行数值模拟,通过水斗数与喷嘴数之间的相互流动计算结果,优化出六喷嘴冲击式水轮机在转轮斗叶数为21个时,正好与喷嘴数相匹配,得到单个水斗接受射流全过程的速度、压力分布以及水流迹线,多个喷嘴同时作用时转轮内部流动的干涉情况。
其他文献
Objectives: To determine the seropositivity of Chlamydia antibody in patients with ruptured ectopic pregnancy compared to normal pregnant women and the risk fac
Purpose: Can Cortisol Releasing Hormone (CRH) levels in follicular fluid predict outcomes following assisted reproductive treatment (ART) cycles? Methods: Prosp
Introduction: Ectopic pregnancy is an emergency in obstetric wards and a significant cause of maternal morbidity and mortality. Incidences of ectopic pregnancy
1.会计外包含义。国内企业对于会计外包的认识还很表面,没有包括内部分析和决策的阶段。其实会计外包并非会计功能的外包,决策、监管等必要流程必然留在企业的内部,外包流程在管
Disseminated peritoneal leiomyomatosis (DPL) is a benign tumor of smooth muscle tissue. It is rare and is characterized by the development of multiple peritonea
会计电算化与一般的会计应用软件不同,它是会计信息系统与企业管理和业务流程的有机结合,但由于财务会计工作的特殊性,现阶段我国会计电算化工作的规划和组织协调很不统一,内部控
Primary ovarian pregnancy is one of the rarest varieties of ectopic pregnancies. Patients frequently present with abdominal pain and menstrual irregularities. P
一、前言随着我国经济体制改革开放的深入发展,企业的生产经营日趋市场化、国际化、全球化,而激烈的国际竞争也使我国的本土企业面临前所未有的机遇与挑战。为此,财政部提出,要研
Ectopic pregnancy has been increasing in frequency over the past 2 decades. The sudden rupture of ectopic pregnancy can lead to haemorrhagic shock and death if
Objective: To compare sexual function between primiparous women who underwent cesarean section (CS) and those who delivered vaginally. Methods: This cross-secti