Planar diffuser performance improvement using injection along the straight diverging walls at subsonic to transonic Mach numbers

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dc.contributor.advisorLalk, Thomas R.
dc.contributor.committeeMemberAnand, N. K.
dc.contributor.committeeMemberRinger, Larry J.
dc.contributor.committeeMemberSomasundaram, Sriram
dc.creatorHassinger, David Alan
dc.date.accessioned2020-09-02T21:04:31Z
dc.date.available2020-09-02T21:04:31Z
dc.date.issued1986
dc.descriptionTypescript (photocopy).en
dc.description.abstractPlanar diffusers with injection along the diverging walls were investigated relative to their pressure recovery performance. Injection orientation, location and slot width were varied for diffusers with aspect ratios of one and six and an area ratio of 11.4. Two inlet flow blockage conditions, 0.04 and 0.20, were investigated. Inlet Mach numbers varied from 0.3 to 0.9 and injector Mach numbers varied from 0.3 to 0.9, with the 30° diffuser exiting to the atmosphere. Traverses of the exit and inlet planes using a pitot tube were made using a computerized data acquisition, control, and positioning system. Uncertainties of 5% or less were maintained for all tests. The diffuser performance, as measured using a modified pressure recovery relationship, was enhanced exceeding 150% for some diffuser/injector configurations. The best performance was achieved for the configuration with injectors located near the diffuser inlet (throat), using a large injection slot. The optimum orientation for the slot was generally parallel to the diffuser inlet, although the orientation parallel to the walls also worked well. The mass flowrate passing through the diffuser was also increased 20% to in excess of 75% at the same pressure recovery.en
dc.format.digitalOriginreformatted digitalen
dc.format.extentxviii, 138 leavesen
dc.format.mediumelectronicen
dc.format.mimetypeapplication/pdf
dc.identifier.oclc17973262
dc.identifier.urihttps://hdl.handle.net/1969.1/DISSERTATIONS-22265
dc.language.isoeng
dc.publisher.digitalTexas A&M University. Libraries
dc.rightsThis thesis was part of a retrospective digitization project authorized by the Texas A&M University Libraries. Copyright remains vested with the author(s). It is the user's responsibility to secure permission from the copyright holder(s) for re-use of the work beyond the provision of Fair Use.en
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/
dc.subjectMajor mechanical engineeringen
dc.subject.classification1986 Dissertation H355
dc.subject.lcshDiffusersen
dc.subject.lcshFluid dynamicsen
dc.subject.lcshFluid dynamicsen
dc.subject.lcshInjectorsen
dc.titlePlanar diffuser performance improvement using injection along the straight diverging walls at subsonic to transonic Mach numbersen
dc.typeThesisen
dc.type.genredissertationsen
dc.type.materialtexten
thesis.degree.grantorTexas A&M Universityen
thesis.degree.nameDoctor of Philosophyen
thesis.degree.namePh. Den

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