Proposal of Concept Shape for Drastic Improvement of Aerodynamic Performance of Heavy-duty Vehicles
-Optimization of Overall Vehicle Shape-

Daisuke Kawano･Soma Iiboshi･Takayuki Ogawa (Osaka Sangyo University)

Because the air drag of a vehicle is proportional to the square of the vehicle speed, the vehicle shape of a long-distance transport truck especially has a significant impact on its fuel efficiency. In this study, the overall vehicle shape, including the cab and luggage compartment, was optimized using a multi-objective optimization method. As a result, it was found that the optimized concept shape significantly reduced air drag while ensuring driving stability.

Aerodynamics Development of Sit-ski for Beijing 2022 Paralympics

Ayaka Iwawaki･Kazuki Funahashi･Tatsuya Mita･Yuko Kobayashi (Toyota Motor)

A sit-skiing event in an alpine skiing is a high-speed downhill competition, so time reduction is achieved through reduced aerodynamics drag.
In order to reduce aerodynamics drag of sit-ski, an analysis of the aerodynamic forces acting on conventional sit-ski, proposals for shapes aimed at reducing aerodynamics drag, and verification of the effectiveness of the proposed shapes were conducted. Therefore, the results are reported.

Study of Aerodynamic Performance Surrogate Modelling for Minivan Vehicles

Hiroshi Tanaka･Yuya Ishiguro･Keiko Amano (Toyota Systems)･Tatsuya Komamura (Toyota Auto Body)

In recent years, the need to improve fuel economy has led to increased demands for aerodynamic performance (reduction of air resistance). Minivans tend to prioritize securing interior space in response to customer needs, which often conflicts with aerodynamic performance. This study reports on the construction of a surrogate model for small to large minivans with the aim of synchronizing design development and aerodynamic performance development in the vehicle development planning stage and predicting aerodynamic performance in a short time.

Numerical Study of the Parameters used in Boiling Heat Transfer Prediction Models under Low Pressure Subcooled Boiling

Yoshiki Tanaka･Takaya Sato･Takeshi Ooyama (DENSO TECHNO)･Yukinori Hamaji･Masayuki Tokitani (National Institute of Fusion Science)･Yoshiyuki Tsuji (Nagoya University)

Most of the boiling models used in the commercial analysis are based on experimental results under high pressure conditions. Thus, we consider that these prediction models have some issue when it used under the low pressure conditions equivalent to the automotive equipment. So we conducted the numerical boiling simulation and compared with the experimental results. And we examined the effect of the boiling parameters.