Effect of Side Taper on Aerodynamics Drag of a Simple Body Shape with Diffuser and without Diffuser

Palaskar, Pruthviraj Mohanrao

doi:10.4271/2016-01-1621

Cited by 7 publications

(4 citation statements)

References 9 publications

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“…This combined effect is why the diffuser generates better drag reduction for the sedan. The above drag results for wagon are in accordance with subsequent study by Palaskar [42] where he inspected the squareback model with rather large 10˚ diffuser and tapering at rear edges of model. The result as shown in Figure 23 shows that large angle diffuser actually increases the drag and it was claimed due to non-cancellation of strong vortices generated because of diffuser and rear wheels of model.…”

Section: Diffusersupporting

confidence: 90%

Review on Flow Controls for Vehicles Aerodynamic Drag Reduction

Mariaprakasam

Mat²,

Samin³

et al. 2023

ARFMTS

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Reducing aerodynamic drag in automobiles has been one of the focuses in automotive industry as it will increase vehicles performance and reduce power consumption which subsequently save the environment. Drag is a force that tend to pull the vehicle backwards. Pressure drag is the major contributor to drag of vehicle which caused by lower pressure in the rear area compared to front of vehicle. When vehicle moves forward, the stagnation point occurs in the front part of vehicle. The airflow then goes over the vehicle and separate at the back due to adverse pressure gradient. Thus, flow separation is created in the rear area of vehicle as indicated by the wake. Wake is a low-pressure region that need to be reduced so that the pressure between the front and rear could be reduced to minimize the drag. Flow control is introduced to delay this flow separation and it has been categorized as active and passive. Active flow controls require power input while passive flow controls do not need power input. This review article will explore those studies on flow controls applied in automobiles and investigate their working mechanisms along with research gaps detected. Relative comparison of effectiveness for each flow control is unfeasible as the parameters used differs but this problem can be resolved. Standard parameters need to be used in future researches in order address the discrepancy of results obtained from numerous studies around the globe. A current flow control technique is proposed to be conducted in UTM Aerolab to further investigate this interesting flow field.

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Section: Diffusersupporting

confidence: 90%

Review on Flow Controls for Vehicles Aerodynamic Drag Reduction

Mariaprakasam

Mat²,

Samin³

et al. 2023

ARFMTS

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“…The Navier-Stokes equations (Equation 1 to 3) and the continuity equation (Equation 4) was used in this flow study. The continuity equation ensures the conservation of mass and momentum [17].…”

Section: Boundary and Numerical Setupmentioning

confidence: 99%

Comparisons of Flow Patterns over a Hierarchical and a Non-hierarchical Surface in Relation to Biofouling Control

Fawzan

Wong

2018

MATEC Web Conf.

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Biofouling can be defined as unwanted deposition and development of organisms on submerged surfaces. It is a major problem as it causes water contamination, infrastructures damage and increase in maintenance and operational cost especially in the shipping industry. There are a few methods that can prevent this problem. One of the most effective methods which is using chemicals particularly Tributyltin has been banned due to adverse effects on the environment. One of the non-toxic methods found to be effective is surface modification which involves altering the surface topography so that it becomes a low-fouling or a non-stick surface to biofouling organisms. Current literature suggested that non-hierarchical topographies has lower antifouling performance compared to hierarchical topographies. It is still unclear if the effects of the flow on these topographies could have aided in their antifouling properties. This research will use Computational Fluid Dynamics (CFD) simulations to study the flow on these two topographies which also involves comparison study of the topographies used. According to the results obtained, it is shown that hierarchical topography has higher antifouling performance compared to non-hierarchical topography. This is because the fluid characteristics at the hierarchical topography is more favorable in controlling biofouling. In addition, hierarchical topography has higher wall shear stress distribution compared to non-hierarchical topography

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“…Grandemange et al 15 studied the effect of the angle of small flaps (or spoilers) located at the top and the bottom of the square-back model trailing edge, and an optimized geometry is found presenting a 5.8% drag reduction compared to the baseline model. Later, PM Palaskar 16 analyzed the combined effects of different tail taper angles and diffuser on vehicle drag, and suggested that the optimal state of the tail taper angle is 10 and simply increase the diffuser will increase the resistance coefficient of the square-back model. Littlewood and colleagues [17][18][19] conducted a series of studies around the square-back model, including passive and active optimization.…”

Section: Introductionmentioning

confidence: 99%

“…Figure16. The contour of time-averaged dimensionless velocity magnitude with vector at the spanwise plane of y ¼ 50 mm.…”

mentioning

confidence: 99%

Experimental investigation on wake flow structures of Motor Industry Research Association square-back model

Zhang

Wang

Yang

et al. 2014

Advances in Mechanical Engineering

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Since the oil crisis of the last century, drag reduction for vehicles has become the focus of researchers. Currently the world’s major car brands have to seize the sport utility vehicle market. However, the sport utility vehicle models usually have a larger frontal area which brings challenges to drag reduction. This requires a better understanding of flow around sport utility vehicle models. The Motor Industry Research Association square-back vehicle model is similar to the sport utility vehicle geometry and can reflect the typical characteristics of aerodynamics of sport utility vehicle models. In this article, the wake flow structures of a 1/8 Motor Industry Research Association model is measured by particle image velocimetry. The results indicate that there is an obviously “n” type backflow vortex behind the vehicle. In the vertical direction, the vortex rotates from the outside to the inside, meanwhile the vortex rotates from the inside to the outside in the longitudinal direction. There is a velocity deficit region between the vortex and the back of the model which is an important source of drag force. This article summarizes the results of particle image velocimetry measurements from the model tests and obtains a picture of the structures of the wake vortex finally which can provide a theoretical basis for the drag reduction research in the future.

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Effect of Side Taper on Aerodynamics Drag of a Simple Body Shape with Diffuser and without Diffuser

Cited by 7 publications

References 9 publications

Review on Flow Controls for Vehicles Aerodynamic Drag Reduction

Review on Flow Controls for Vehicles Aerodynamic Drag Reduction

Comparisons of Flow Patterns over a Hierarchical and a Non-hierarchical Surface in Relation to Biofouling Control

Experimental investigation on wake flow structures of Motor Industry Research Association square-back model

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