构成
发表于 2025-3-25 03:19:13
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DAMP
发表于 2025-3-25 10:46:36
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babble
发表于 2025-3-25 13:37:17
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Ordnance
发表于 2025-3-25 17:28:16
Unsteady propulsion,e one seems to be: a propeller is unsteady when no inertial reference frame exists with respect to which the induced flow is time independent. This however is not appropriate because then nearly all conceivable propulsion systems are unsteady with the only exception probably of the sails of a yacht
让你明白
发表于 2025-3-25 20:46:53
Optimization theory,ribed force action. We assume the fluid to be inviscid and incompressible. First we have to define what will be called the best way of working of a device. We restrict ourselves to the minimization of a simple cost function, namely the kinetic energy losses per unit of time.
EVEN
发表于 2025-3-26 00:41:11
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检查
发表于 2025-3-26 05:02:20
Book 1984enerally based on lift producing profiles. We assume the fluid, which is admitted in conventional hydrody namics, to be incompressible. Further we assume the occurring Reynolds numbers to be sufficiently high such that the inertia forces dominate by far the viscous forces, therefore we take the flu
figment
发表于 2025-3-26 10:35:22
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Jacket
发表于 2025-3-26 13:54:00
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发誓放弃
发表于 2025-3-26 18:32:32
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