Shen Shifei

Transient analyses of the passive residual heat removal system

The steam generator secondary residual heat removal system is a new design with three-fold natural circulation loop. It is the candidate of the safeguard systems of next generation pressurized water reactor design in China. This paper presents the development of a program, which would be used in the system design. One-dimensional drift flux mixture flow model is used for analysis of the steam water loop, whereas single-phase fluid model is applied to single flow in primary system and air loop. Based on the mathematical model, the code SGSPRHR has been developed. The transient analyses, when station black out accident happens, have been made. Sensitivity study results have also been given. The calculated parameter variation trends are reasonable.

Research of spatial distribution rules of mass incidents based on GIS

The research of hot-spots is an important subject in public safety field as well as GIS system application, it reveals the spatial distribution law of crime and help develop targeted security preventive strategy, providing safeguards for the whole society. The mass incident is a special kind of public safety incident, but there are little research on its spatial distribution rules from the perspective of geography. This article analyzes the spatial distribution rules of mass incidents in China from the macro point of view and based on the spatial autocorrelation and Kernel density estimation, then finds hot-spots and calculates the degree of spatial agglomeration to express the spatial distribution law of crime. CCS Concepts • Information systems➝ Database management system➝ Database design and models ➝ Graph-based database models.

Assessment of Human Safety and Thermal Comfort in High‐Temperature Environment: CFD and Human Thermoregulation Model

The safety and the thermal comfort of victims and firefighters are important in the building fires, which are a little dependent on the occupant fatalities. In order to investigate the effects of the dangerous environment on human body in fires, numerical calculation of the heat transfer and human thermoregulation are presented in this paper. The numerical manikins coupled with human thermal models were proved as powerful tools for visualizing thermal comfort. The two‐node model by Gagge and multi‐code thermoregulation models were investigated, and the Gagge’s model was coupled with the CFD for high‐temperature environment simulation, with which a numerical manikin was built. During the simulation, temperatures of skin and core compartment of Computer Simulated Person (CPS) were recorded respectively, and the Predicted Mean Vote index values were counted. The thermal load on skin is much higher than neutral cases and the skin can be burnt in minutes if no protection and heat abstraction methods were intro...