Active control of base pressure with counter clockwise rotating cylinder at Mach 2

Asadullah, Mohammed; Khan, Sher Afghan; Asrar, Waqar; Sulaeman, Erwin

doi:10.1109/icetas.2017.8277857

Cited by 12 publications

(10 citation statements)

References 28 publications

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“…From their study, it has been found that microjets are useful to control the base pressure. Asadullah, et al (2017Asadullah, et al ( , 2018a have worked on a passive method to control the base pressure by the static and dynamic cylinder. The effectiveness of rotating cylinder of 2 mm diameter to control the base pressure has been investigated experimentally and from their tests it has been found that dynamic cylinders are capable of controlling the base pressure at high nozzle pressure ratios which is required for the correctly expanded case and the maximum gain in the base pressure is up to 65%.…”

Section: Fig 1 Suddenly Expanded Flow Fieldmentioning

confidence: 99%

Effect of Nozzle Pressure Ratio and Control Jets Location to Control Base Pressure in Suddenly Expanded Flows

Pathan¹,

Dabeer²,

Khan

2019

JAFM

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In this paper, computational fluid dynamic (CFD) analysis and experiments have been carried out to study the effect of nozzle pressure ratio, i.e. the ratio of inlet pressure to atmospheric pressure, and the pitch circle diameter of the control jets to regulate the base pressure. The variables considered for the analysis as well as the experiments are the nozzle pressure ratio (NPR), the Mach number (M) and the pitch circle diameter (PCD) of the control jets. The area ratio considered for the study is kept constant at 4.84 while the length to diameter (L/D) ratio of an enlarged duct is set constant at 5. The inertia parameter considered for the study is Mach number. The Mach numbers considered for study are 1.5, 2.0, and 2.5. The nozzle pressure ratio considered for study are 2, 5 and 8. Three different pitch circle diameters of control jets considered for study are 13.1 mm, 16.2 mm and 19.3 mm. From the numerical simulations and the results of the experimental tests, it is found that the control jets are very beneficial to increase the base pressure at higher NPR when the jets issuing from the nozzles are under-expanded. The control jets were able to increase the base pressure value from 160% to 400% at nozzle pressure ratio 8. It is concluded that the parameter D3 is the most effective pitch circle diameter of the control jets to increase the base pressure.

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Section: Fig 1 Suddenly Expanded Flow Fieldmentioning

confidence: 99%

Effect of Nozzle Pressure Ratio and Control Jets Location to Control Base Pressure in Suddenly Expanded Flows

Pathan¹,

Dabeer²,

Khan

2019

JAFM

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“…[9]- [12] studied the wall pressure distribution flow after control the base pressure using microjet controller. Active and passive control using small cylinder well studied experimentally [13]- [17]. Khan et al, [18]- [20] investigated the number of studies for base pressure control in a CD nozzle and the effectiveness of the microjets and also, the flow field inside the across the duct length.…”

Section: Mohammed Faheem Mohammed Kareemullah Abdul Aabid Imran Momentioning

confidence: 99%

Experiment on of Nozzle Flow with Sudden Expansion at Mach 1.1

2019

IJRTE

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This present study discusses the outcome of the experimental investigations, and the efficacy of the tiny jets used to regulate the base pressure as well as the wall pressure in suddenly expanded flow. The control mechanism as tiny jets having a cross-section of 1 mm diameter was employed as the base pressure regulator at the exit periphery of the nozzle. The experiments were carried out to investigate and record the flow field at the rear end of the separated flow region for area ratio 4.84. Four tiny jets were placed at a distance of 6.5 mm away from the primary jet coming from the nozzle exit at ninety degrees apart, and the tiny control jets were flowing at sonic Mach number. The actual Mach number of the main jet was 1.1. The experimentation was accomplished at a different level of expansion (i. e., NPR = 3, 5, 7, 9, and 11) and the L/D ratio considered was from 10 to 1. This study mainly focuses on the development of the flow in the suddenly expanded duct, nature of the flow in the duct, and the impact of the Control on the wall pressure and the magnitude of the pressure along the duct. The wall pressure in the smooth duct is not unfavorably influenced by the control jets.

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“…Influence of microjet control for different area ratio's well studied by the authors [14]- [17]. Experimentally investigated the cylindrical effects of base pressure control using active and passive method [18]- [22].…”

Section: S a Khan Zaheer Ahmed Abdul Aabid Imran Mokashimentioning

confidence: 99%

Experimental Research on Flow Development and Control Effectiveness in the Duct at High Speed

2019

IJRTE

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This paper presents an experimental study of suddenly expanded flows at supersonic speed is performed. A Convergent-divergent (C-D) nozzle is used with suddenly expanded duct. At the recirculation zone, the pressure is controlled by using four microjets of 1 mm diameter arranged at PCD of 1.3 as an active control mechanism to regulate the pressure in the wake region. The development and the quality of the flow were monitored to ensure that the flow control does not aggravate the flow field in the duct. The geometrical and the inertia parameters are the area ratio and the Mach number. The area of the study was 3.24, L/D ratio was from 10 to 1, and the level of inertia as 2.1. The expansion level considered during the experiments was from 3 to 11. The results clearly indicate that the wall pressure variation with and without control in the enlarged duct does not vary, which means that the use of control does not affect the flow filed in the circular duct.

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Active control of base pressure with counter clockwise rotating cylinder at Mach 2

Cited by 12 publications

References 28 publications

Effect of Nozzle Pressure Ratio and Control Jets Location to Control Base Pressure in Suddenly Expanded Flows

Effect of Nozzle Pressure Ratio and Control Jets Location to Control Base Pressure in Suddenly Expanded Flows

Experiment on of Nozzle Flow with Sudden Expansion at Mach 1.1

Experimental Research on Flow Development and Control Effectiveness in the Duct at High Speed

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