Analysis of Coupled Internal and External Flow Field for an Electric Car Open Cabin

• Main Authors: Yen Yu-An, 顏堉安
• Other Authors: Leong Jik-Chang
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/03493921065334461989

碩士 === 國立屏東科技大學 === 車輛工程系所 === 100 === This work investigates the exterior and interior flow field of an electric car open cabin. CFD simulations associated to the car travelling at speeds of 10 km/hr to 60 km/hr were performed to estimate the form drag and flow rate of air entering the cabin. Since the rotating wheels may produce dusty air, several modifications had been designed to prevent the dusty air from entering the car cabin. These designs include (1) chassis channel, (2) side protrusion plate, (3) guided passage, (4) hood passage, and (5) a combination of guided passage and hood passage. The original design suffers from dust entering the cabin. Through appropriate modifications, the diffusion of dust into the cabin can be suppressed. Simulation results prove that the chassis channel fails to hinder dust from entering the cabin. The side protrusion plates cause plenty of dust circulating at the side cabin edge. There were three different guided passage designs examined in this thesis. Wheel guard guided passage was found to greatly reduce the amount of dust entering the cabin. Also, the hood passage is capable of guiding plenty of ambient air into the cabin, increasing the cabin pressure, and decreasing the amount of dusty air entering the cabin from both sides. When the wheel guard guided passage design and hood passage design are combined, the quality of cabin air has been found to improve greatly. The side protrusion plate design generates the least form drag but the greatest air flow rate in the cabin. Therefore, this design is superior for electric car traveling on dustless pave way. The wheel guard guided passage design, the hood passage design, and their combination, that are effective in preventing dusty air from entering the cabin, are suitable for dusty roads. If the flow-rate-form-drag ratio is to be considered, the side protrusion plate design is the most beneficial. If dust diffusion is critical, the combination design is the most suitable choice among the cases considered in this thesis.