Đang chuẩn bị nút TẢI XUỐNG, xin hãy chờ
Tải xuống
An internal combustion engine changes chemical energy to mechanical energy. The system also produces unwanted heat and due to moving parts has internal friction which further reduces the system efficiency. | Mechanical Engineering ME 481 Vehicle Design Fall 2000 Lecture Notes By Richard B. Hathaway Ph.D. PE Professor Mechanical and Aeronautical Engineering Section 1 Energy Consumption and Power Requirements in Design 2 Aerodynamics and Rolling Resistance GENERAL FORMULAS - AERODYNAMIC Dynamic Pressure Pd 2 p v 2 Drag Force 1 Fd 2 P v2 Af RE Fd 1 p v2 CdA Fd 1 1.2 Cd A v v0 2 2 2 Aero Power P V3 A f RE 2 Cd coefficient of drag p air density 1.2 kg m3 A projected frontal area m2 f RE Reynolds number v vehicle velocity m sec Vo headwind velocity ENGLISH UNITS HPaero 6.93 X u Cd A V3 where A area ft2 V velocity MPH Cd drag coefficient
