{"id":{"repo_id":"nps","oai_identifier":"oai:calhoun.nps.edu:10945/12423"},"canonical_url":"https://search.dev.ndltd.org/etd/nps/oai:calhoun.nps.edu:10945/12423","repository":{"repo_id":"nps","name":"Naval Postgraduate School","base_url":"https://calhoun.nps.edu/server/oai/request"},"display":{"title":"An investigation of the effect of a tangential gas velocity on combustion instability.","abstract":"A small, uncooled research rocket motor was built to study the effects of a vortex flow on combustion instability. Normal heptane and air were used as propellants with the air being divided into two flows; a primary flow at the center of the combustion chamber and a secondary flow at the periphery of the chamber. The secondary air provided the swirl which could be directed clockwise or counterclockwise at various angles or a straight mode of operation. Runs were made at various flow rates with the direction of swirl changed during the run. A first tangential high frequency mode of combustion instability was developed and a significant change in stability conditions was found when a vortex flow was generated within the combustion chamber. It was found that a swirl in one direction tended to decrease the instability while a flow in the opposite direction increased it.","abstract_html":"A small, uncooled research rocket motor was built to study the effects of a vortex flow on combustion instability. Normal heptane and air were used as propellants with the air being divided into two flows; a primary flow at the center of the combustion chamber and a secondary flow at the periphery of the chamber. The secondary air provided the swirl which could be directed clockwise or counterclockwise at various angles or a straight mode of operation. Runs were made at various flow rates with the direction of swirl changed during the run. A first tangential high frequency mode of combustion instability was developed and a significant change in stability conditions was found when a vortex flow was generated within the combustion chamber. It was found that a swirl in one direction tended to decrease the instability while a flow in the opposite direction increased it.","abstract_has_math":false,"creators":["Kiel, Joseph Alan"],"institution":"Monterey, California. U.S. Naval Postgraduate School","degree_name":null,"degree_level":null,"degree_discipline":null,"degree_department":"Aeronautics","school":null,"contributors":[],"advisors":["Netzer, David W."],"committee_chairs":[],"committee_members":[],"year":1969,"date_issued":"1969-06","date_published":"1969-06","updated_at":"2026-07-27T20:25:20Z","subjects":[],"languages":["en_US"],"rights":["This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States."],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"https://hdl.handle.net/10945/12423","outbound_label":"Handle","outbound_source":"dc:identifier.uri"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor.advisor","label":"Advisor","values":["Netzer, David W."]},{"key":"dc:contributor.department","label":"Department","values":["Aeronautics"]},{"key":"dc:creator","label":"Author","values":["Kiel, Joseph Alan"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["June 1969"]},{"key":"dc:date.accessioned","label":"Dc Date Accessioned","values":["2012-08-29T23:32:31Z"]},{"key":"dc:date.available","label":"Dc Date Available","values":["2012-08-29T23:32:31Z"]},{"key":"dc:date.issued","label":"Date","values":["1969-06"]},{"key":"dc:publisher","label":"Institution","values":["Monterey, California. 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Normal heptane and air were used as propellants with the air being divided into two flows; a primary flow at the center of the combustion chamber and a secondary flow at the periphery of the chamber. The secondary air provided the swirl which could be directed clockwise or counterclockwise at various angles or a straight mode of operation. Runs were made at various flow rates with the direction of swirl changed during the run. A first tangential high frequency mode of combustion instability was developed and a significant change in stability conditions was found when a vortex flow was generated within the combustion chamber. It was found that a swirl in one direction tended to decrease the instability while a flow in the opposite direction increased it."]},{"key":"dc:title","label":"Title","values":["An investigation of the effect of a tangential gas velocity on combustion instability."]}]}],"canonical_facts":{"dc:contributor.advisor":["Netzer, David W."],"dc:contributor.department":["Aeronautics"],"dc:creator":["Kiel, Joseph Alan"],"dc:date":["June 1969"],"dc:date.accessioned":["2012-08-29T23:32:31Z"],"dc:date.available":["2012-08-29T23:32:31Z"],"dc:date.issued":["1969-06"],"dc:description.abstract":["A small, uncooled research rocket motor was built to study the effects of a vortex flow on combustion instability. Normal heptane and air were used as propellants with the air being divided into two flows; a primary flow at the center of the combustion chamber and a secondary flow at the periphery of the chamber. The secondary air provided the swirl which could be directed clockwise or counterclockwise at various angles or a straight mode of operation. Runs were made at various flow rates with the direction of swirl changed during the run. A first tangential high frequency mode of combustion instability was developed and a significant change in stability conditions was found when a vortex flow was generated within the combustion chamber. It was found that a swirl in one direction tended to decrease the instability while a flow in the opposite direction increased it."],"dc:identifier.uri":["https://hdl.handle.net/10945/12423"],"dc:language.iso":["en_US"],"dc:publisher":["Monterey, California. U.S. Naval Postgraduate School"],"dc:rights":["This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States."],"dc:title":["An investigation of the effect of a tangential gas velocity on combustion instability."],"dc:type":["Thesis"]},"updated_at":"2026-07-27T20:25:20Z"}