Implications of Velocity Ratio on the Characteristics of a Circular Synthetic Jet Flush Mounted on a Torpedo Model in Quiescent and Cross-Flow Conditions

18 Pages Posted: 1 Jul 2019

See all articles by Abhay Kumar

Abhay Kumar

University of Petroleum and Energy Studies (UPES)

Arun K Saha

IIT Kanpur

Pradipta K Panigrahi

IIT Kanpur

Ashish Karn

University of Petroleum and Energy Studies, Dehradun

Date Written: June 30, 2019

Abstract

A high velocity ratio synthetic jet on an arched surface is of great interest for its potential applications in navy, including torpedo. However, in spite of detailed research on synthetic jets over a flat surface in cross-flow, very few observations have been made on synthetic jets over a surface which is torpedo-like. This study experimentally explores a synthetic jet mounted on a torpedo shaped model in quiescent and cross-flow conditions. Initially, the synthetic jet is characterized for two different diaphragm displacements and at four distinct actuation frequencies in the range of 1 Hz – 6 Hz in a quiescent flow environment. Subsequently, in cross flow similar study is conducted for three cross-flow velocities ranging from 7.2 – 32 cm/s, at a fixed amplitude of diaphragm oscillations. The measurements are carried out using Laser Induced Fluorescence (LIF) and Laser Doppler Velocimetry (LDV) and the qualitative LIF visualizations are corroborated by the quantitative LDV data. These results indicate that the synthetic jet vortex rings can be grouped as stretched vortex rings and distorted tilted vortex rings. The flow structures primarily depend on the velocity ratio, which is function of cross-flow velocity and frequency of actuation.

Keywords: Synthetic Jet, Torpedo Model, Vortex Rings, Velocity Ratio, Jet in Cross Flow, LIF

Suggested Citation

Kumar, Abhay and Saha, Arun K and Panigrahi, Pradipta K and Karn, Ashish, Implications of Velocity Ratio on the Characteristics of a Circular Synthetic Jet Flush Mounted on a Torpedo Model in Quiescent and Cross-Flow Conditions (June 30, 2019). Available at SSRN: https://ssrn.com/abstract=3412294 or http://dx.doi.org/10.2139/ssrn.3412294

Abhay Kumar

University of Petroleum and Energy Studies (UPES)

Energy Acres
P.O. Bidholi via Premnagar,
Dehradun, IN Uttarakhand 248007
India

Arun K Saha

IIT Kanpur ( email )

Kanpur

Pradipta K Panigrahi

IIT Kanpur ( email )

Kanpur

Ashish Karn (Contact Author)

University of Petroleum and Energy Studies, Dehradun ( email )

Energy Acres
P.O. Bidholi via Premnagar,
Dehradun, IN Uttarakhand 248007
India

HOME PAGE: http://umn.edu/~karn

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