无油螺杆膨胀机工作过程模拟及热力性能分析  

Simulation of Performance and Analysis of Thermal Characteristics for Oil-free Twin Screw Expander

作　　者：刁安娜[1] 韩冰 冯明志[1] 彭学院[2] Diao Anna;Han Bing;Feng Mingzhi;Peng Xueyuan(Shanghai Marine Diesel Engine Research Institute,Shanghai 201108,China;Xi'an Jiaotong University,Xi'an 710049,China)

机构地区：[1]中国船舶重工集团公司第七一一研究所,上海201108 [2]西安交通大学,西安710049

出　　处：《化工设备与管道》2018年第5期49-53,共5页Process Equipment & Piping

基　　金：国家自然科学基金资助项目:压力突变诱发的波流互动激发出来气流脉动机理的研究(51306136);中国船舶重工集团公司第七一一研究所基金项目:高温高压差新型螺杆膨胀机组研制(Z2017Z2-020/006-LG)

摘　　要：在无油螺杆膨胀机工作过程中,膨胀机实际有效效率是在等熵效率的基础上还要考虑理想效率和机械效率,等熵效率对机组有效效率的影响最大,等熵效率主要受泄漏和流动损失的影响,其中泄漏损失占主要因素,接近35%,流动损失不到5%。细化了泄漏通道模型,分析比较容积效率随啮合间隙、齿顶间隙和端面间隙的变化趋势,其中齿顶间隙对容积效率的影响最大,超过其他两类间隙的两倍以上。因此,合理减小齿顶间隙是提高容积效率最有效的途径。In the working process of the oil-free screw expander,the total efficiency of the unit was analyzed.It was found that the total efficiency is influenced significantly by the isentropic efficiency of the expander,which could be attributed to the gas leakage within the expander,and the leakage loss is the main factor and close to 35%,however the flow loss less than 5%.In this paper,the calculation model of each leakage channel,including meshing clearance,end-face clearance and tip clearance between rotors and case,was refined.The influence of tip clearance to the volumetric efficiency is the largest,more than twice that of the other two types of clearance.Therefore,reasonable reduction of tip clearance is the most effective way to improve the volumetric efficiency.

关 键 词：无油双螺杆膨胀机 工作过程模拟 热力性能分析 

分 类 号：TQ051.3[化学工程] TH138[机械工程—机械制造及自动化]