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The diameter of the hollow core of a solid propellant grain remains axially uniform during burning. Its length is 5 m, and initially its inner diameter is 0.37m; the outer diameter of the grain is 0.82m. The burning rate r is 1.2cm/s, which as a first approximation may be assumed uniform over the entire inner surface of the grain. The grain density is 1875 kg/m^3. The combustion chamber pressure and gas temperature downstream of the grain are 2.17 MPa and 2580K, respectively. Neglecting the effects of friction, estimate, at the beginning and end of combustion:
a) The static pressure ratio p2/p1 along the length of the grain
b) The Mach number M2 at the downstream end of the grain The gas specific heat ratio and molecular weight are 1.2 and 20.
a a refrigeration system has a coeiumlnotfnofcient of performance of 5. the heat rejection is an isothermal process at
Find the stress in both members shown below and what steel specifications (types of steel) are suitable for structural applications?
at t0 a disk with mass 3kg is placed on a spinning platform. the disk slides and begins to accelerate. if the maximum
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suppose that 100 lmin are drawn from a fermentation tank and passed through an extraction tank in which the
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