An Inviscid Supersonic Nozzle Design Approach to Perfect Flow Uniformity for Wind Tunnel Applications

Yen, Joseph; Martindale, W. R.

doi:10.2514/6.2008-7059

Cited by 6 publications

(3 citation statements)

References 4 publications

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“…In this work, flow quality was quantified via the function 𝜓 that should be minimized (Equations 5 and 6). The location of the Mach wave reflections can be predicted using inviscid flow models as described by Yen [17], and hence a parameter sweep based on Euler CFD models is used to reduce the nozzle design regions from the initial set where 𝑑 ! ranges between (0.05, 0.45) and 𝑑 " ranges between (0.5, 0.8), to the ;(.<=!.&>+#?…”

Section: A:! 8and4"$yand=#$83*3/and*3)$mentioning

confidence: 99%

Real-Time Motion Planning for Quadcopter Using Adaptive Spherical Expansion and Sequential Convex Optimization

Karaman

Kurt

Millidere

et al. 2023

AIAA SCITECH 2023 Forum

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Section: A:! 8and4"$yand=#$83*3/and*3)$mentioning

confidence: 99%

Real-Time Motion Planning for Quadcopter Using Adaptive Spherical Expansion and Sequential Convex Optimization

Karaman

Kurt

Millidere

et al. 2023

AIAA SCITECH 2023 Forum

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Section: A Mach Wave Mitigationmentioning

confidence: 99%

Design and Optimisation of a Mach 2.5 Wind Tunnel Nozzle

Moreno

Zachos

Haslam

et al. 2023

AIAA SCITECH 2023 Forum

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The paper presents a methodology for the numerical design and optimization of a distortion-free two-dimensional Mach 2.5 nozzle based on a parametric model. The nonuniformities generated at the Mach wave reflections downstream of the nozzle throat that the Method of Characteristics only partially addresses are minimized. The spatial discretization of the domain is integrated with the boundary layer analysis for fast and robust data processing, especially in the final viscous sublayers in the transition regions within the bulk of the fluid. The flow patterns and corner flows of the supersonic nozzle are assessed via threedimensional high-fidelity computational fluid dynamics. As a result, a fast workflow for nozzle design to meet prescribed flow quality requirements is herein illustrated.

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“…For the easiness of computation, TOC can be closely approximated by a skewed parabola called Thrust Optimized Parabola (TOP) with minimum loss of performance (Rao, 1960). Yen and Martindale (2008) used inviscid supersonic nozzle design approach for getting ideal uniform test section flow in wind tunnel applications. In the rhombus region, they observed that the accelerating Mach number turn constant and the following compression waves become absolutely linear.…”

Section: Introductionmentioning

confidence: 99%

Design of a double parabolic supersonic nozzle and performance evaluation by experimental and numerical methods

Mubarak

Tide

2018

AEAT

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Purpose The purpose of this paper is to design a double parabolic nozzle and to compare the performance with conventional nozzle designs. Design/methodology/approach The throat diameter and divergent length for Conical, Bell and Double Parabolic nozzles were kept same for the sake of comparison. The double parabolic nozzle has been designed in such a way that the maximum slope of the divergent curve is taken as one-third of the Prandtl Meyer (PM) angle. The studies were carried out at Nozzle Pressure Ratio (NPR) of 5 and also at design conditions (NPR = 3.7). Experimental measurements were carried out for all the three nozzle configurations and the performance parameters compared. Numerical simulations were also carried out in a two-dimensional computational domain incorporating density-based solver with RANS equations and SST k-ω turbulence model. Findings The numerical predictions were found to be in reasonable agreement with the measured experimental values. An enhancement in thrust was observed for double parabolic nozzle when compared with that of conical and bell nozzles. Research limitations/implications Even though the present numerical simulations were capable of predicting shock cell parameters reasonably well, shock oscillations were not captured. Practical implications The double parabolic nozzle design has enormous practical importance as a small increase in thrust can result in a significant gain in pay load. Social implications The thrust developed by the double parabolic nozzle is seen to be on the higher side than that of conventional nozzles with better fuel economy. Originality/value The overall performance of the double parabolic nozzle is better than conical and bell nozzles for the same throat diameter and length.

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An Inviscid Supersonic Nozzle Design Approach to Perfect Flow Uniformity for Wind Tunnel Applications

Cited by 6 publications

References 4 publications

Real-Time Motion Planning for Quadcopter Using Adaptive Spherical Expansion and Sequential Convex Optimization

Real-Time Motion Planning for Quadcopter Using Adaptive Spherical Expansion and Sequential Convex Optimization

Design and Optimisation of a Mach 2.5 Wind Tunnel Nozzle

Design of a double parabolic supersonic nozzle and performance evaluation by experimental and numerical methods

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