Micro-jets in confined turbulent cross flow

Journal Article · Wed Mar 01 04:00:00 EST 2006 · Experimental Thermal and Fluid Science

DOI:https://doi.org/10.1016/j.expthermflusci.2005.07.006· OSTI ID:20711981

Kelman, J B; Greenhalgh, D A ^[1]; Whiteman, M ^[2]

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1. School of Engineering, Cranfield University, Cranfield, Bedfordshire MK43 0AL (United Kingdom)
2. Rolls-Royce plc, Combustion systems, Moor Lane, Derby DE24 8BJ (United Kingdom)

The mixing of sub-millimetre diameter jets issuing into a turbulent cross flow is examined with a combination of laser diagnostic techniques. The cross flow stream is in a confined duct and the micro-jet issue from the sides of injector vanes. A range of cross jet momentum ratios, cross flow temperatures and turbulence intensities are investigated to examine the influence on the jet mixing. Methane, seeded with acetone, was used to measure the concentrations of the jets and the mixing of the jet fluid in the duct. Unlike previous jet in cross flow work, mixing appears to be dominated by the free stream turbulence, rather than the cross jet momentum ratios. Temperature increases in the free stream appear to increase the rate of mixing in the duct, despite the associated decrease in the Reynolds number. The dominance of the free stream turbulence in controlling the mixing is of particular interest in respect of gas turbine injection systems, as the cross jet momentum ratio is insufficient in defining the mixing process. (author)

• OSTI ID: 20711981
• Journal Information: Experimental Thermal and Fluid Science, Journal Name: Experimental Thermal and Fluid Science Journal Issue: 4 Vol. 30; ISSN 0894-1777; ISSN ETFSEO
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
GAS INJECTION
GAS TURBINE POWER PLANTS
JETS
MIXING
REYNOLDS NUMBER
TEMPERATURE DEPENDENCE
TURBULENT FLOW