Novel Characteristics of Subsonic Coflowing Jets With Varying Lip Thickness

Abstract

Effect of Mach number on coflowing jet at lip thickness of 0.2 Dp, 1.0 Dp and 1.5 Dp (where Dp is primary nozzle exit diameter, 10 mm) at Mach numbers 1.0, 0.8 and 0.6 were studied experimentally. It was found that an increase in Mach number does not have any profound effect on axial total and static pressure variation for 0.2 Dp. Decreasing the mean diameter is due to the geometrical constraints. In this study, the primary nozzle dimension and secondary duct is maintained constant for comparison. For the case of 0.2 Dp, static pressure is almost equal to atmospheric pressure for all Mach numbers. Whereas for other two lip thickness, increase in Mach number marginally influences axial total pressure and profoundly varies static pressure. It is noted that it varies considerably up to 11.1% in the axial direction and up to 17% in the radial direction for Mach number 1.0. For lower Mach numbers, such variation is not observed. Increase in Mach number increases static pressure variation in the coflowing jet flow field with lip thickness 1.0 Dp and 1.5 Dp.

Investigation of Jet Mixing Characteristics Using Slotted Rectangular Tabs

“…Grooved and chevron nozzles are used as certain techniques in jet flow control (Elangovan and Rathakrishnan 2004;Tide and Srinivasan 2010;Kumar et al 2011). Nozzles are also modified to issue co-flowing jets to control the flow in the subsonic regime (Lovaraju and Rathakrishnan 2011;Shankar et al 2016;Shankar et al 2018;Shankar and Bennett 2019;Thanigaiarasu et al 2019;Shankar and Raja 2020).…”