Numerical Simulations of a CD Nozzle and the Influence of the Duct Length
Mohammad Nishat Akhtar1, Elmi Abu Bakar2, Abdul Aabid3, Sher Afghan Khan4

1Mohammad Nishat Akhtar, School of Aerospace Engineering, Universiti Sains Malaysia, Nibong Tebal, Penang, Malaysia.

2Elmi Abu Bakar, School of Aerospace  Engineering, Universiti Sains Malaysia Nibong Tebal, Penang, Malaysia.

3Abdul Aabid, Department of  Mechanical Engineering, Faculty of Engineering, IIUM, Kuala Lumpur, Malaysia.

4Sher Afghan Khan, Department of Mechanical Engineering, Faculty of Engineering, IIUM, Kuala Lumpur, Malaysia. 

Manuscript received on 20 August 2019 | Revised Manuscript received on 27 August 2019 | Manuscript Published on 31 August 2019 | PP: 47-51 | Volume-8 Issue-9S2 August 2019 | Retrieval Number: I11270789S219/19©BEIESP DOI: 10.35940/ijitee.I1127.0789S219

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Abstract: A numerical method is used to observe the effect of microjets control on wall pressure spreading in sudden expansion two-dimensional planar duct. In order to find the microjet effectiveness 2-jets of 1 mm diameter orifice located precisely at 900 of intervals along a pitch-circle-distance (PCD) of 1.3 times the exit diameter of the nozzle in the base were employed to control actively. At the present study, the Mach number was used to calibrate the entry to duct was 2.2, and the area ratio of 2.56. The focus in this study and investigate the influence of length-to-diameter ratio (L/D) of a suddenly expanded duct and its effect on the development of the flow field. Hence, to achieve this, the duct length has been varied from 2 to 10. Nozzles are producing such Mach numbers the experiments were performed operating at nozzle pressure ratio (NPR) 3, 5, 7, 9, and 11. The convergent-divergent nozzle geometry has been studied using the K-ε standard wall function turbulence model and independently check with the ANSYS software.

Keywords: Nozzle, Area Ratio, Nozzle Pressure Ratio, Microjet, Flow Control, ANSYS Simulation, CFD.
Scope of the Article: Numerical Modelling of Structures