Journal ArticleDOI
Investigation of High-Speed Flow Control from CD Nozzle Using Design of Experiments and CFD Methods
Abdul Aabid,Sher Afghan Khan +1 more
TLDR
In this paper, the authors used the microjets in the form of an orifice of a 1-mm diameter to inject the air in the base flows and located at base area of 90° intervals as a control mechanism.Abstract:
In high-speed fluid dynamics, the control of base pressure finds many engineering applications such as automobile industry and defense applications. Several studies have been reported on passive control using devices like cavities, ribs, aerospikes, etc. in the last three decades. Therefore, the present research focuses on active control uses the microjets in the form of an orifice of a 1 mm diameter to inject the air in the base flows and located at base area of 90° intervals as a control mechanism. Since the air is drawn from the main settling chamber, the NPR will be the same as the respective NPRs used for tests. Experiments were conducted in the presence and absence of the microjets for area ratio 3.24 and L/D ratios from 10 to 1 at Mach numbers 1.87, 2.2, and 2.58. The parameters were optimized using the design of experiments (DOE) approach. Three parameters have been selected for the flow and the DOE. An L9 orthogonal array, multiple linear regression, and confirmation tests were performed to analyze the experimental results. The developed models are statistically suitable and accomplished in producing reasonable predictions for both cases. Besides, a computational fluid dynamics method has been utilized and validated by the experimental results. The k–Ɛ turbulent model is used to analyze the simulation results. According to the present results, it is evident that for a given parameter, an L/D ratio is the most significant impacting to a maximum increment or decrement of a base pressure.read more
Citations
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Journal ArticleDOI
Influence of microjets on flow development for diameter ratio of 1.6 for correctly expanded nozzles
Mohammed Faheem,Mohammed Faheem,Rayid Muneer,Mohammed Avvad,Mohammed Aneeque,Sher Afghan Khan +5 more
TL;DR: In this article, a microjet was used as a management tool for the duct's flow field with a diameter ratio of 1.6 (i.e., area ratio = 2.56) and the flow remained connected with the duct for duct length twice the nozzle exit diameter.
Journal ArticleDOI
Benefit of Mach number and expansion level on the flow development in a cylindrical tube diameter of 18 mm
Sher Afghan Khan,Maughal Ahmed Ali Baig,Ridwan,Rayid Muneer,J.I. Suheel,Mohammed Faheem,Mohammed Faheem +6 more
TL;DR: In this article, experiments are performed at high Mach numbers to examine the flow control effect located in the separated region at 6.5 mm from the central jet, where a circular orifice is placed in the wake region to manipulate the base flow to boost the wake area's pressure and ultimately reduce the base drag.
Journal ArticleDOI
Effect of expansion level on the flow development with sudden expansion at high Mach numbers
TL;DR: In this article, the influence of favorable and adverse pressure gradients on flow growth and control efficacy was evaluated at the nozzles for Mach 1.25 to 3.0 at various duct lengths.
Journal ArticleDOI
Optimization of dry sliding wear behavior of aluminium-based hybrid MMC's using experimental and DOE methods
TL;DR: In this paper , an attempt was made to investigate the dry sliding wear behavior of aluminium-based hybrid MMC's through the experimental approach, where three types of filler materials: Boron carbide (B4C), Molybdenum Di-sulphide (MoS2), and graphite (Gr) particulates of 50 μm were reinforced into aluminium-2219 matrix using stir casting technique.
Journal ArticleDOI
Buckling Analysis of a Thin-Walled Structure Using Finite Element Method and Design of Experiments
TL;DR: In this article , a finite element method was utilized using the ABAQUS commercial tool, and the results of critical buckling load for different laminate types were obtained for different types of holes.
References
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Application of the energy-dissipation model of turbulence to the calculation of flow near a spinning disc
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