Studi Karakteristik Aliran Udara Kendaraan dengan Penambahan Spoiler Belakang Standard Dan Lebih Panjang

Moch. Aziz Kurniawan, Yogi Oktopianto, Aat Eska Fahmadi, Pipit Rusmandani
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Abstract

The use of rear spoilers on MPV vehicles is often used by the public to get an aerodynamic vehicle body design. The understanding of the function of using rear spoiler accessories in the community is still low, so it is necessary to study the characteristics of air flow in aerodynamics. This study aims to determine the flow characteristics of MPV type vehicles with standard and longer rear spoiler installation. This research was conducted in a Subsonic Open Circuit wind tunnel with test section dimensions (365 x 365 x 1250) mm. The flow characteristics were observed experimentally that passed through the model surface resembling the first generation Toyota Avanza MPV with a ratio of 1:20 with variations of the standard and longer rear spoiler installation. Measurement of the flow velocity profile behind the vehicle test model was carried out at an X/L ratio of 0.32 from the leading edge with a speed adjusted to the Reynolds number value of 1.96 x 105. The flow characteristic observed was the pressure distribution (Cp) on the center line of the top surface. and under the test vehicle model, the flow momentum deficit behind the test vehicle model, the lift pressure coefficient (CLP), and the drag pressure coefficient (CDP). The results of data collection show that the installation of a standard and longer rear spoiler relatively increases the Cp value, the flow momentum deficit behind the vehicle model, the lift pressure coefficient (CLP) value and decreases the drag pressure coefficient (CDP) value. The biggest increase was in the installation of a longer rear spoiler with an increase in the Cp value of 4.7%, an increase in the flow momentum deficit by 1.27%, an increase in the CLP value by 0.11% and a decrease in the CDP value by 0.06% compared to the vehicle model without using a rear spoiler.
对车辆气流的特性进行了研究,并增加了标准的后扰流模式和更长时间
在MPV车辆上使用后扰流板经常被公众用于获得空气动力学车身设计。社会上对后扰流板附件使用功能的认识还很低,因此有必要对空气动力学中的气流特性进行研究。本研究的目的是确定标准后扰流板和加长后扰流板的MPV型车辆的流动特性。本研究是在一个亚音速开路风洞中进行的,测试截面尺寸为(365 x 365 x 1250) mm。通过类似于第一代丰田Avanza MPV的模型表面的流动特性进行了实验观察,该模型的比例为1:20,具有不同的标准和更长的后扰流板安装。在距前缘X/L比为0.32的条件下,将速度调整为雷诺数1.96 X 105,对车辆试验模型后的流速剖面进行测量。观察到的流动特性是顶面中心线上的压力分布(Cp)。试验车型下,试验车型后的动量差、升力压力系数(CLP)、阻力压力系数(CDP)。数据采集结果表明,标准加长后扰流板的安装相对增加了Cp值、车型后动量亏损、升力压力系数(CLP)值和阻力压力系数(CDP)值。与未安装后扰流板的车型相比,安装较长的后扰流板的车型增加幅度最大,Cp值增加了4.7%,动量赤字增加了1.27%,CLP值增加了0.11%,CDP值减少了0.06%。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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