Second-order closure prediction of premixed turbulent combustion in jets

Thesis/Dissertation · Tue Jan 01 04:00:00 EST 1985

OSTI ID:5972872

Dave, N

This thesis is a report on work carried out and results obtained in the prediction of a turbulent flow of premixed combustible gases discharging from a pipe and developing into a turbulent, combusting roundjet. The expressions for the chemical reaction rate term and other unclosed terms in the Favre averaged turbulent transport equations at the level of second-order closure are based on the Bray-Moss-Libby aerothermochemistry for premixed turbulent combustion. The numerical technique used is a parabolic solver developed by Kolmann from the GENMIX program due to Patankar and Spalding. Various test cases such as constant density and variable density jets are calculated using the program and the results are compared herein with experimentally observed values. Results for premixed turbulent combusting jets are compared with experimental data of Yoshida and of Shepherd and Moss. Buoyancy is found to play an important role in the behavior of these premixed combusting jets. Reasonable numerical agreement is obtained with the results of Yoshida, and good qualitative agreement is obtained with the data of Shepherd and Moss. Reasons for the discrepancies and limitations of the numerical simulation are discussed.

• Research Organization: California Univ., San Diego (USA)
• OSTI ID: 5972872
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400800* -- Combustion
Pyrolysis
& High-Temperature Chemistry
42 ENGINEERING
421000 -- Engineering-- Combustion Systems
CHEMICAL REACTIONS
COMBUSTION
FLUID FLOW
JETS
KINETICS
NUMERICAL SOLUTION
OXIDATION
REACTION KINETICS
THERMOCHEMICAL PROCESSES
TURBULENT FLOW