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Showing 1 to 8 of 8 for “"nozzle pressure ratio"”.
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Effect of Nozzle Pressure Ratio on Thrust and Flow Behavior in a Supersonic De Laval Nozzle
<p>Supersonic nozzles operate across a range of flow regimes. While an ideally expanded condition yields optimal thrust, practical propulsion systems rarely operate at this design point due to variations in altitude and engine operating conditions. As a result, nozzles frequently operate in …
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Development of Specialized Laser Doppler Velocimeters for High Resolution Flow Profile and Turbulence Spectral Measurements
… optical access. The new instrument, a next generation version of the previously developed 'comprehensive' LDV technology, enables measurements of three components of velocity and particle position in the axial direction all through a single transceiving lens. Described here is the design process …
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Aeroacoustic measurement and analysis of transient supersonic hot nozzle flows
… tunnel facility was utilized to produce short duration, 10-20 millisecond, under expanded supersonic hot air jets from a series of scaled nozzles. The primary purpose of the facility is to investigate noise suppressor nozzle concepts relevant to supersonic civil transport aircraft applications. …
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Characterization and Analysis of Supersonic Flow Through De Laval Nozzles at Varied Design Conditions
… experimental investigation of supersonic planar nozzles under different design conditions has been conducted. Supersonic planar nozzles are common geometries observed in supersonic wind tunnels and aircraft or rocket engines. For the important role they play in wind tunnel testing and aircraft …
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Modern Methods in Machine Learning as Applied to the Study of a Complex Supersonic Jet Flow
… and faster has led to the use of more complex nozzle geometries over the last several decades. These nozzles often take advantage of multiple high-velocity streams issuing from non-axisymmetric exit areas and can be optimized for airframe integration and stealth performance. The associated …
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Axisymmetric Bi-propellant Air Augmented Rocket Testing with Annular Cavity Mixing Enhancement
… rocket mixing duct with annular cavity configurations intended to produce thrust augmentation. Three mixing duct geometries and a fully annular cavity at the exit of the nozzle were tested to enable thrust comparisons. The rocket engine used liquid ethanol and gaseous oxygen, and was …
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The Effect of Thermal Non-Uniformity on Coherent Structures in Supersonic Free Jets
… with little modification to the engine and nozzle. Prior work has shown that total temperature non-uniformity is a noise reduction technique which introduces a stream of cold flow into the heated jet. This method has been shown to cause changes in the exhaust plume and result in a 2±0.5 dB …
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The fluid-structure interaction of an axisymmetric underexpanded jet flowing across an adjacent compliant surface
… both rigid-surface and compliant-surface configurations. To date, the vast majority of the literature for both the rigid- and compliant-surface cases has been generated by the acoustics community, and so most of the results obtained in those studies are rooted in pointwise measurements. This has …