Mode switching in supersonic circular jets
An underexpanded supersonic circular jet was studied experimentally in a pressure ratio range of 2–15, yielding an equivalent Mach number range of 1.1–2.4 downstream of the nozzle. Spark Schlieren photography and near‐field pressure measurements showed large changes in the jet structure for differen...
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| Veröffentlicht in: | Physics of fluids. A, Fluid dynamics Fluid dynamics, 1989-05, Vol.1 (5), p.868-873 |
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| container_end_page | 873 |
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| container_issue | 5 |
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| container_title | Physics of fluids. A, Fluid dynamics |
| container_volume | 1 |
| creator | Gutmark, E. Schadow, K. C. Bicker, C. J. |
| description | An underexpanded supersonic circular jet was studied experimentally in a pressure ratio range of 2–15, yielding an equivalent Mach number range of 1.1–2.4 downstream of the nozzle. Spark Schlieren photography and near‐field pressure measurements showed large changes in the jet structure for different Mach numbers. For nearly sonic exit velocity, the jet had a dominant symmetric structure and spreading rate similar to subsonic conditions. For an exit velocity equivalent to M>1.2, the jet switched mode to a helical structure with an accompanying substantial increase in the spreading rate. A transitional region was determined for 1.12 |
| doi_str_mv | 10.1063/1.857384 |
| format | Article |
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C. ; Bicker, C. J.</creator><creatorcontrib>Gutmark, E. ; Schadow, K. C. ; Bicker, C. J.</creatorcontrib><description>An underexpanded supersonic circular jet was studied experimentally in a pressure ratio range of 2–15, yielding an equivalent Mach number range of 1.1–2.4 downstream of the nozzle. Spark Schlieren photography and near‐field pressure measurements showed large changes in the jet structure for different Mach numbers. For nearly sonic exit velocity, the jet had a dominant symmetric structure and spreading rate similar to subsonic conditions. For an exit velocity equivalent to M>1.2, the jet switched mode to a helical structure with an accompanying substantial increase in the spreading rate. A transitional region was determined for 1.12<M<1.18, in which the jet switched modes intermittently from axisymmetric to helical. For Mach numbers higher than 1.6, another structural change was observed, related to the emergence of a normal shock in the first shock cell. The structural changes affected the near‐field pressure fluctuations of the jet. The jet with the helical structure had a strong pressure field component in the upstream direction that could be related to the higher spreading rate of the jet.</description><identifier>ISSN: 0899-8213</identifier><identifier>EISSN: 2163-5013</identifier><identifier>DOI: 10.1063/1.857384</identifier><identifier>CODEN: PFADEB</identifier><language>eng</language><publisher>Woodbury, NY: American Institute of Physics AIP</publisher><subject>Compressible flows; shock and detonation phenomena ; Exact sciences and technology ; Fluid dynamics ; Fundamental areas of phenomenology (including applications) ; Physics</subject><ispartof>Physics of fluids. 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J.</creatorcontrib><title>Mode switching in supersonic circular jets</title><title>Physics of fluids. A, Fluid dynamics</title><description>An underexpanded supersonic circular jet was studied experimentally in a pressure ratio range of 2–15, yielding an equivalent Mach number range of 1.1–2.4 downstream of the nozzle. Spark Schlieren photography and near‐field pressure measurements showed large changes in the jet structure for different Mach numbers. For nearly sonic exit velocity, the jet had a dominant symmetric structure and spreading rate similar to subsonic conditions. For an exit velocity equivalent to M>1.2, the jet switched mode to a helical structure with an accompanying substantial increase in the spreading rate. A transitional region was determined for 1.12<M<1.18, in which the jet switched modes intermittently from axisymmetric to helical. For Mach numbers higher than 1.6, another structural change was observed, related to the emergence of a normal shock in the first shock cell. The structural changes affected the near‐field pressure fluctuations of the jet. The jet with the helical structure had a strong pressure field component in the upstream direction that could be related to the higher spreading rate of the jet.</description><subject>Compressible flows; shock and detonation phenomena</subject><subject>Exact sciences and technology</subject><subject>Fluid dynamics</subject><subject>Fundamental areas of phenomenology (including applications)</subject><subject>Physics</subject><issn>0899-8213</issn><issn>2163-5013</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>1989</creationdate><recordtype>article</recordtype><recordid>eNp9z01LxDAUheEgCo6j4E_owoUKHXPvbdN0KYNfMOJG1yW9aTRDbUvSUfz3OlRmp6uzeXjhCHEKcgFS0RUsdF6QzvbEDEFRmkugfTGTuixTjUCH4ijGtZSYQZbNxOVjb5skfvqR33z3mvguiZuhCbHvPCfsA29aE5J1M8ZjceBMG5uT352Ll9ub5-V9unq6e1her1ImxDFFaMiQZM6tMqVhlNbpkmpnS7ASlDS1RszBEoMtjCoJHGPOCms2BWqai_Opy6GPMTSuGoJ_N-GrAlltP1ZQTR9_6NlEBxPZtC6Yjn3c-QIVSdoWLyYW2Y9m9H33X_JP-9GHnasG6-gblldrSA</recordid><startdate>19890501</startdate><enddate>19890501</enddate><creator>Gutmark, E.</creator><creator>Schadow, K. C.</creator><creator>Bicker, C. J.</creator><general>American Institute of Physics AIP</general><scope>IQODW</scope><scope>AAYXX</scope><scope>CITATION</scope></search><sort><creationdate>19890501</creationdate><title>Mode switching in supersonic circular jets</title><author>Gutmark, E. ; Schadow, K. C. ; Bicker, C. J.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c322t-21e3a30cc5d6a9ac20df893bfd91d0160ab82251d3c1d7a6931fc25c62bca7283</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>1989</creationdate><topic>Compressible flows; shock and detonation phenomena</topic><topic>Exact sciences and technology</topic><topic>Fluid dynamics</topic><topic>Fundamental areas of phenomenology (including applications)</topic><topic>Physics</topic><toplevel>online_resources</toplevel><creatorcontrib>Gutmark, E.</creatorcontrib><creatorcontrib>Schadow, K. C.</creatorcontrib><creatorcontrib>Bicker, C. J.</creatorcontrib><collection>Pascal-Francis</collection><collection>CrossRef</collection><jtitle>Physics of fluids. A, Fluid dynamics</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Gutmark, E.</au><au>Schadow, K. C.</au><au>Bicker, C. J.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Mode switching in supersonic circular jets</atitle><jtitle>Physics of fluids. A, Fluid dynamics</jtitle><date>1989-05-01</date><risdate>1989</risdate><volume>1</volume><issue>5</issue><spage>868</spage><epage>873</epage><pages>868-873</pages><issn>0899-8213</issn><eissn>2163-5013</eissn><coden>PFADEB</coden><abstract>An underexpanded supersonic circular jet was studied experimentally in a pressure ratio range of 2–15, yielding an equivalent Mach number range of 1.1–2.4 downstream of the nozzle. Spark Schlieren photography and near‐field pressure measurements showed large changes in the jet structure for different Mach numbers. For nearly sonic exit velocity, the jet had a dominant symmetric structure and spreading rate similar to subsonic conditions. For an exit velocity equivalent to M>1.2, the jet switched mode to a helical structure with an accompanying substantial increase in the spreading rate. A transitional region was determined for 1.12<M<1.18, in which the jet switched modes intermittently from axisymmetric to helical. For Mach numbers higher than 1.6, another structural change was observed, related to the emergence of a normal shock in the first shock cell. The structural changes affected the near‐field pressure fluctuations of the jet. The jet with the helical structure had a strong pressure field component in the upstream direction that could be related to the higher spreading rate of the jet.</abstract><cop>Woodbury, NY</cop><pub>American Institute of Physics AIP</pub><doi>10.1063/1.857384</doi><tpages>6</tpages></addata></record> |
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| ispartof | Physics of fluids. A, Fluid dynamics, 1989-05, Vol.1 (5), p.868-873 |
| issn | 0899-8213 2163-5013 |
| language | eng |
| recordid | cdi_scitation_primary_10_1063_1_857384 |
| source | AIP Digital Archive |
| subjects | Compressible flows shock and detonation phenomena Exact sciences and technology Fluid dynamics Fundamental areas of phenomenology (including applications) Physics |
| title | Mode switching in supersonic circular jets |
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