Numerical simulation and experimental studies of highly-loaded valveless pulsed combustors

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dc.contributor.advisorKentfield, John A. C.
dc.contributor.authorOlorunmaiye, John Adesiji
dc.date.accessioned2005-07-21T21:12:27Z
dc.date.available2005-07-21T21:12:27Z
dc.date.issued1984
dc.descriptionBibliography: p. 226-241.en
dc.description.abstractThe main objectives of the work were to develop a numerical model that simulates the operation of valveless pulsed combustors and to study the effects of flow pulsations on heat transfer rate in such a combustor through experimental measurements which would also provide results for assessing the validity of the model. Dynamic pressure, time-average heat flux, wall and gas temperatures were measured at six ports in the propane-fuelled combustor. The convective heat transfer coefficients in the combustion chamber were slightly less than steady flow values in most cases whereas they were mostly between 1.5 to 3 times as high as steady flow values, in the tail pipe. The effects of wall friction, heat transfer and composition changes due to chemical reaction were considered in the numerical simulation. Application of the conservation principles of fluid mechanics to the one-dimensional flows in the inlet and tail pipe yielded a system of first order hyperbolic partial differential equations which were integrated by a numerical method of characteristics. For the combustion chamber which was treated as a large reservoir, the conservation principles gave a set of ordinary differential equations since the gas mixture in it was assumed to have negligible kinetic energy and uniform thermodynamic properties. The agreement between theoretically predicted results and experimental measurements were good within the limits of experimental error in some cases orily but the predicted trends agreed with experimental measurements in all the comparisons. Since the flow pulsations enhance heat transfer considerably in the tail pipe, it is necessary to divert sufficient cool secondary air flow past the tail pipe for the combustor to have a long service life in jet drying, thrust generation and gas turbine applications. Using the numerical model, modifications to the tail pipe geometry that would give the experimental unit improved performance were suggested. From the results predicted with the model, it was concluded that intermittent combustion occurs in the combustion chamber through variations in the concentrations of carbon-dioxide and oxygen.
dc.description.notesThis title is not available online. Access options are: - consulting the copy from Archives in our reading room in person - https://asc.ucalgary.ca/visiting/ - borrowing a circulating copy from the Library catalogue – https://ucalgary.primo.exlibrisgroup.com/discovery/search?vid=01UCALG_INST:UCALGARY&lang=en
dc.format.extentxxviii, 251 leaves : ill. ; 30 cm.en
dc.identifier.citationOlorunmaiye, J. A. (1984). Numerical simulation and experimental studies of highly-loaded valveless pulsed combustors (Doctoral thesis, University of Calgary, Calgary, Canada). Retrieved from https://prism.ucalgary.ca. doi:10.11575/PRISM/22105en_US
dc.identifier.doihttp://dx.doi.org/10.11575/PRISM/22105
dc.identifier.lccTJ 254.5 O44 1985en
dc.identifier.otherNL Number: 66508en
dc.identifier.urihttp://hdl.handle.net/1880/23422
dc.language.isoeng
dc.publisher.institutionUniversity of Calgaryen
dc.publisher.placeCalgaryen
dc.rightsUniversity of Calgary graduate students retain copyright ownership and moral rights for their thesis. You may use this material in any way that is permitted by the Copyright Act or through licensing that has been assigned to the document. For uses that are not allowable under copyright legislation or licensing, you are required to seek permission.
dc.subject.lccTJ 254.5 O44 1985en
dc.subject.lcshCombustion engineering
dc.subject.lcshHeat - Transmission
dc.subject.lcshPulse techniques (Electronics)
dc.titleNumerical simulation and experimental studies of highly-loaded valveless pulsed combustors
dc.typedoctoral thesis
thesis.degree.disciplineMechanical Engineering
thesis.degree.grantorUniversity of Calgary
thesis.degree.nameDoctor of Philosophy (PhD)
ucalgary.thesis.notesoffsiteen
ucalgary.thesis.uarcreleasenoen
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