Involved in compressor performance testing, an inlet probe support causes flow blockage and produces shedding vortex, which affects aerodynamic performance of the compressor. In this paper a single-stage transonic compressor NASA Stage 35 is taken as an example, and a cylindrical probe support with 10mm diameter is located one chord away from the rotor leading edge. Steady and unsteady flow simulation for the compressor stage with and without the support is carried out by commercial CFX software tool. Results show that the support brings about substantial performance degradation of compressor. Meanwhile, the characteristics of the vortex shedding from the support and the flow field structure of compressor change by the interaction of the support and the compressor. The shedding vortex frequency of probe support is affected by the working condition of the compressor. Under the strong interaction of probe support and transonic rotor leading edge shock, the shedding vortex frequency of probe support is locked by the rotor blade passing. Wider distance between the support and leading edge of the rotor gives rise to homologous change of eddy phase in the rotor.

High fidelity simulation of complex turbulent flame is still challenging from many aspects. The present study aims to make the progress from two aspects. The first one is the turbulence modeling, which is achieved by using the newly developed VLES (Very-Large Eddy Simulation) method. The VLES method is a self-adaptive turbulence modeling method which can resolve the turbulence based on the local mesh resolution and the local turbulence scale information. It evolves smoothly from RANS to DNS with the increase of the mesh resolution. It thus can provide accurate predictions on relatively coarse meshes. The second one is the combustion modeling, which is done by combining the FGM (Flamelet Generated Manifold) method. FGM method is an efficient chemistry reduction technique, which has attracted attentions for the successful applications to various complex combustion systems. The present study thus makes the effort to combine the VLES and FGM methods to model complex turbulent flames. Two test cases are selected, i.e. the classical Sandia D flame and the swirling premixed flame from a single GE LM6000 combustor. The numerical results are compared with available experiments. It is found that the VLES-FGM method can be successfully applied for the high fidelity simulation of the complex test flames. The VLES method has high potentials for turbulent flame simulations.

An Immersed Boundary Method combined with Half-Domain Body-Fitted Meshes has been proposed, in order to simulate three-dimensional viscous compressible flow through complex geometry objects such as propeller and propfan. Orthogonal Cartesian grids are adopted to simulate the mainstream, and the "body-fitted equidistant surface grids" immersed in the Cartesian grids are adopted to simulate the viscous flow near the surface. So that the mainstream could feel the effects of surface geometry exactly. The equidistant surface grids generated by copying the object surface along the outer normal direction, are half-space constrained. It's easy and fast to automatically generate Half-Domain Body-Fitted grids, which have excellent orthogonality, and very suitable for viscous compressible unsteady flow simulation with turbulence model. Strategies for finding contribution units and interpolating flow information have been introduced in detail. Flux Vector Splitting method and WENO-Z scheme were used for spatial discretization, while Runge-Kutta method for temporal discretization. S-A model was adopted for turbulence simulation. Numerical verification examples of both steady and unsteady flow are presented.

There are a huge amount of old residential buildings in Shanghai which involve a large number of residents. With the aging of the buildings, structural or architectural problems are exposed. Therefore, it is necessary to investigate the old residential buildings. This paper collects the data of 34 old residential clusters in three districts of Pudong New Area of Shanghai by means of questionnaire and field survey. It analyzes the causes of the differences in architectural problems of old houses in different regions, different ages and different types of structures. This paper also probes into the causes of structural problems of old residential buildings. And it accumulates important basic data for improving the comprehensive renovation level of old residential buildings and perfecting related laws and regulations in Shanghai.