Response of a pulse combustor to changes in total ignition delay time
The response of a valved pulse combustor to changes in the relative timing between the resonant pressure wave and the energy release rate is examined. Experiments were performed in which measurements of combustion chamber pressure, operating frequency, and spatially-integrated, time-resolved ensemble-averaged chemiluminescence were made. The total time interval required for energy release is divided into a fluid dynamic species mixing time, a second fluid dynamic mixing time between cold reactants and hot reaction products, and a homogeneous chemical kinetic ignition delay time. Each of these time scales is varied independently, as well as the characteristic resonance time of the pulse combustor. It is shown that each time scale can be varied separately to optimize the operation of the pulse combustor. All of these system responses are interpreted in terms of Rayleigh's Criterion. In addition, theoretical models for the fluid dynamic mixing process and the chemical kinetic ignition delay are used to determine actual values for the time scales for some of these subprocesses.
- Research Organization:
- Lawrence Livermore National Lab., CA (USA)
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 6473584
- Report Number(s):
- UCRL-96437; CONF-870541-1; ON: DE87008843
- Resource Relation:
- Conference: Combustion fundamentals and applications: spring technical meeting of the Central States Section of the Combustion Institute, Argonne, IL, USA, 11 May 1987
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
PULSE COMBUSTORS
CHEMICAL REACTION KINETICS
COMBUSTION KINETICS
FLOW MODELS
CHEMILUMINESCENCE
COMBUSTION PRODUCTS
COMBUSTION WAVES
ENERGY TRANSPORT
FLOW RATE
FLUID FLOW
IGNITION SYSTEMS
RESPONSE FUNCTIONS
COMBUSTORS
FUNCTIONS
KINETICS
LUMINESCENCE
MATHEMATICAL MODELS
REACTION KINETICS
421000* - Engineering- Combustion Systems
400800 - Combustion
Pyrolysis
& High-Temperature Chemistry