Abstract. Take the rotating detonation engine combustion chamber wall which under great heat flux as the research background. The characteristics of impingement cooling under different parameters were studied by numerical simulation, then analyzing and getting a better Impingement cooling structure. It is found that under the same air mass flow rate and constant heat flux,when the diameter of impingement hole is d=4mm, the impingement distance is H=4mm, the hole spacing is Xn=Yn= 35.168mm,the cooling effect is the best. With the cooling structure, the cooling of the heated wall with constant heat flux of 500000 W/m 2 was studied. The results show that when the Reynolds number is Re = 50000, the wall is cooled and the wall temperature is reduced to a reasonable range.

No abstract

Statistical shape analysis is a widely studied topic with applications ranging in biology, anatomy, neuroscience, agriculture, paleontology, etc. In many cases, two sets of shapes are input to the algorithm and the output is a mean shape with a scalar map defined on it indicating the local discrepancy between the two groups. In this work, we propose a new shape analysis algorithm. It is able to handle shapes with arbitrary topology. Specifically, the algorithm constructs a Signed Poisson Map (SPM) by solving two Poisson equations on the volumetric shapes, and statistical analysis is then carried out on the SPMs. The algorithm is tested on both synthetic and real shape data sets.

Abstract. Improve the accuracy of ignition calculate simulation through dynamic thickening of the of flame front in order to achieve Large Eddy Simulation (LES) solution scales. Taking the WALL model which takes the sticky near the wall into account as the sub-grid turbulence model, simulating the process of energy releasing of spark plug by the way of adding Gauss heat source to the energy function. 40ms of the ignition process is calculated based on the cold state flow field, and compare the numerical simulation results with corresponding experimental results abroad. It shows: The simulation accuracy of cold flow field of LES is good, and be able to capture small-size vortex; Large Eddy Simulation based on dynamic thickening flame model is an effective method to predict the dynamic diffusion processes of CH 4 non-premixed flame; Recirculation zone plays an important role of fuel distribution, flame spread and stability.