First Article Preproduction Tests of the AH-64A Helicopter

Bender, Gary L; Voss, James S.; MacMullin, Robert; Adkins, James M

doi:10.21236/ada170594

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2021

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“…In the past, the majority of rotor blades were designed primarily through experimental testing (and preliminary analytical studies). This includes many rotors that still fly today, such as the UH-60A [4], AH-64A [5], S-76 [6], CH-47 [7] or BERP III [8]. However, numerical methods have seen a wider use in rotor design in the past 20-30 years.…”

Section: Introductionmentioning

confidence: 99%

Rotor-Blade Planform Design Based on an Overset Harmonic-Balance-Adjoint Optimization Framework

et al. 2021

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Optimisation methods in conjunction with CFD are a key tool in advancing current rotor design. High-fidelity optimisation of unsteady rotor flows in forward flight, however, is a challenging problem due to the high computational resources required. To minimize the computational costs, a fully-turbulent, overset, adjoint, harmonic balance, optimisation framework has been developed, which maintains the fidelity of the Navier-Stokes equations. The framework is demonstrated in the aerodynamic re-design of the AH-64A rotor blade. An analysis of the optimised rotor blade is presented, including the key design features that contribute to the performance benefits in each of the examined design conditions. In particular, the benefits and drawbacks of rotor designs with an offloaded blade tip have been discussed. The formulation

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Section: Introductionmentioning

confidence: 99%