NASA Technical Reports Server (NASA) · 1979 · 143 citations · 7 references
AeroacousticsEngineeringFluid MechanicsVerificationSimilitude RequirementsSoftware EngineeringModel-based TestingUnsteady FlowCompressible FlowComputational TestingSystems EngineeringIntegration TestingModeling And SimulationTestabilityStatisticsVarious Similitude RequirementsScaling RelationshipsScale ModelingDesignSoftware DesignTest FrameworkAerospace EngineeringSoftware TestingMeasurement ModelsCivil EngineeringTurbulence ModelingAerodynamicsModel TestData Modeling
Similitude requirements are examined in the context of scaling relationships, test techniques, conditions—including supersonic flow—and objectives. The paper presents general similitude requirements and details how free‑flying model test velocities are scaled from Froude numbers for incompressible flow and Mach numbers for compressible flow, emphasizing compliance with these requirements. It identifies limitations of various test techniques, particularly for free‑flying models.
The similitude requirements for the most general test conditions are presented. These similitude requirements are considered in relation to the scaling relationships, test technique, test conditions (including supersonic flow), and test objectives. Particular emphasis is placed on satisfying the various similitude requirements for incompressible and compressible flow conditions. For free flying models tests, the test velocities for incompressible flow are scaled from Froude number similitude requirements and those for compressible flow are scaled from Mach number similitude requirements. The limitations of various test techniques are indicated, with emphasis on the free flying model.
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