Abstract
Altitude compensating nozzles provide optimum performance over a wide range of altitudes. The planar expansion–deflection nozzle is one such nozzle. It has a rectangular cross-section, and altitude compensation is achieved by incorporating a pintle beyond the throat of a conventional convergent–divergent nozzle. The objective of the present Paper is to investigate the variations in flow caused as a result of a varying pintle base shape in a planar expansion–deflection nozzle. The computational fluid dynamics approach is used for conducting the analysis. Nozzle contour and pintle geometry up to the throat is kept unchanged, and simulations are conducted by altering the geometry of the pintle base profile. For each expansion–deflection nozzle configuration, the flow pattern, base pressure, and coefficient of thrust generated by nozzle are studied over a range of nozzle pressure ratios. The results of the numerical study reveal that the curved pintle with highest base curvature showed better overall performance in terms of contribution of base pressure to thrust output, whereas the pintle with an inclined base indicated the better overall coefficient of thrust when compared to pintles at higher nozzle pressure ratios due to higher contribution from momentum thrust.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
