现代制冷空调技术.ppt

Simulation of leakage characteristics of refrigerants in rolling piston type rotary compressor 朱奕豪 D201477300 2015. Mathematical modeling 1.Types of leakage 2.Geometryand thermodynamic analyses 3.Thermodynamicproperties of refrigerant-oil mixtures 4.Models for thermodynamic properties evaluation of two-phase fluid 5. Governing equations Leakage losses through radial clearance between wall of rolling piston and wall of cylinder. Leakage losses through clearances between the faces of the rolling piston and head walls of the cylinder. Leakage losses through clearances between the faces of the sliding vane and head walls of the cylinder. Leakage losses through clearances between the sides of the sliding vane and side walls of the chutes inside the cylinder. 1.Types of leakage 2.Geometry and thermodynamic analyses 2.Geometry and thermodynamic analyses Where h?? denotes the length of the sliding vane invading into the cylinder. 3.Thermodynamic properties of refrigerant-oil mixtures 4.Models for thermodynamic properties evaluation of two-phase fluid 5. Governing equations 5.1Leakage flow rate caused by pressure difference  the leakage flow rate of the two-phase fluid in the radial clearance is given by: Similarly, leakage flow rate of the two-phase fluid through the clearance between the faces of the sliding vane and the head walls of the cylinder can be expressed by: 5.2 Leakage flow rate caused by wall velocity  the mass flow rate of the leakage caused by wall velocity per unit length in the width direction of the leakage channel is expressed by: The mass flow rate caused by wall velocity of the rolling piston can be obtained as: Thank you! * 好课件要交流，浙教版初中科学课件交流QQ群瑞安市东山中学　杨直梭 QQ有点烦之家：/ * 好课件要交流，浙教版初中科学课件交流QQ群瑞安市东山中学　杨直梭 QQ * 好课件要交流，浙教版初中科学课件交流QQ群瑞安市东山中学　杨直梭 QQ有点烦之家：/ * 好课件要交流，浙教版初中科学课件交流QQ群瑞安市东山中学　杨直梭 QQ