Numerical modelling of Mars supersonic disk-gap-band parachute inflation

Parachute dynamics and perturbation analysis of precision airdrop system

In this study, the effect of inclined partial periodic magnetic field on natural convection flow of a hybrid nanofluid in isosceles right triangular cavities is numerically investigated. The presence of periodic partial magnetic field is also compared with the full magnetic field. Steady, dimensionless governing equations in stream function-vorticity formulation are approximated by radial basis function based partition of unity method. Further, periodic magnetic field is kept at a fixed inclination angle regarding to the symmetry axis of its sinusoidal wave structure. The considered main parameters are Hartmann number (0≤Ha≤100) and period of the periodic magnetic field (0.25≤Λ≤1). The augmentation in Lorentz force is resulted with decrease in fluid velocity and convective heat transfer. Inhibitive effect at period one of periodic magnetic field is significantly noticed at all considered cases. Partial periodic magnetic field may be a good controller wherever fluid motion and temperature are to be stabilized inside the cavity. 

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Combined influence of rectangular wire coil and twisted tape on flow and heat transfer characteristics in square mini-channels

http://www.dtic.mil/cgi-bin/GetTRDoc?AD=AD0246490&Location=U2&doc=GetTRDoc.pdf

Analysis of heavy-duty parachute reliability

Effects of regular triangular prisms on thermal and hydraulic characteristics in a minichannel heat sink

A parachute is a kind of decelerator that requires very high reliability. Inflation is a primary step that causes the failure of a parachute structure, especially for a slot parachute. If success/failure data from the airdrop experiment or numerical simulation are to be used for assessing the reliability of a parachute, a series of experiments or simulations is necessary. However, this process is unacceptable in engineering because of the high cost required. A new assessment method is proposed in this paper, and a novel simulation method of slot-parachute inflation is investigated to obtain strength test data. In the assessment method, strength test data are used as the prior information and integrated with inflation simulation information to assess parachute reliability using the Bayesian theory. This method is derived from a strict mathematical theory. The assessment results are consistent with the parachute's actual performance. The simulation results demonstrate the effectiveness of the proposed appro...

Qing-Bin Zhang

Papers

Effects of regular triangular prisms on thermal and hydraulic characteristics in a minichannel heat sink

Reliability assessment of slot-parachute inflation based on Bayes theory