Shu Yao

Simulation of Transmission Efficiency for Different Bending Radius of Aerosol Sampling Inlet

The purpose of the paper is to simulate transmission efficiency for different bending radius of aerosol sampling inlet using CFD. To evaluate the transmission efficiency, we introduced Discrete Phase Model to simulate aerosol movement. Results from simulations show that the greater transmission efficiency aerosol sampling inlet will be, the larger bending radius is. At 300mm bending radius, aerosol transmission efficiency is almost 1 for 10μm diameter of particular matter. The CFD model can effectively simulate the characteristic and loss of aerosol particulate matters through the bending tube.

Numerical Simulation of Air Distribution and Particle Movement in a Displacement Ventilated Room

As people spend more time indoors, indoor air quality becomes more and more important. Displacement ventilation, as a new type of air-conditioning strategy, has showed remarkable advantages on many occasions. In this paper, the air movement and particle distribution in a displacement ventilation room is studied and analyzed through CFD numerical simulation method. The results show that the airflow field and the temperature field all have obvious hierarchical structure, and the coarse particles have more obvious settling character.

CFD Analysis of Shrouded Diameter in Aerosol Sampling Inlet

This paper presents CFD analysis of shrouded diameter in aerosol sampling inlet. Different shrouded diameter for the sampling inlet will be simulated and discussed in detail. The objective of the design is to optimizing the sampling inlet flow necessary for achieving high efficiency of aerosol sampling, while minimizing disturbance to the aircraft which carries aerosol sampling inlet. The design optimization was performed with the computational fluid dynamics (CFD) code FLUENT. The shrouded diameter to minimizing flow disturbance is 150mm. A shrouded diameter understanding derived from the CFD analysis could improve shrouded design.

Simulation of Aerosol Sampling Inlet for Different Outlet Angle

Performance of aerosol sampling inlet for different diffuser outlet angle is compared with its velocity and pressure distribution. To get information on velocity and pressure distribution for different outlet angle, Computational Fluid Dynamic (CFD) simulation can be used. At the same time, it can achieve high efficiency of aerosol sampling and minimize disturbance to the aircraft which carries the system. The final design for the sampling inlet is determined to be a design with diffuser outlet angle of 15 degree. This design was selected to keep stable for velocity and pressure, and have a less length.

Flow Analysis of a Shrouded Aerosol Sampling Inlet

A shrouded aerosol sampling inlet has been designed from high-speed aircraft. The sampling inlet was conducted using the CFD to perform a flow simulation. The shroud diameter is 150 mm. The inlet is located 180mm from the shroud entrance plane. The shroud is 300 mm long. Results are presented graphically, showing the shrouds have provided significant improvements in flow characteristics. Straighten the streamlines of gas of sampling inlet for flow angles up to five degrees. It is suggested that CFD simulation can be useful for improving the optimum a shrouded aerosol sampling inlet.

Optimizing Leading Edge Structure for Aerosol Sampling Diffuser

A diffuser leading edge has been designed for aircraft aerosol sampling. The diffuser leading edge fluid was conducted using the CFD. The diffuser inlet, middle and outlet diameter is 35.3, 100 and 35.3 mm, respectively. The angle of the diffuser inlet and outlet is 4°. The diffuser inlet and outlet with leading edge have achieved isokinetic sampling, and have stable flow and pressure distribution. It is suggested that CFD simulation can be useful for improving the optimum the diffuser.

Aircraft-Carried Aerosol Sampling Inlet by CFD Simulation

A aerosol sampling inlet has been designed from high-speed aircraft. The objective of the design is to achieving isokinetic and minimizing disturbance for the sampling system. This study was conducted using the CFD code to perform a turbulent simulation of the airflow on the aerosol sampling inlet. The inlet is flown regularly on board an aircraft of Yun-12. The flow rate through the sampling suction tube is a constant value of 100 L/min. The shroud diameter is 150 mm. The diffusion tube inlet and outlet diameter is 35.3 mm. The suction tube diameter is 20.6 mm, which act as transferring aerosol at the velocity of 5 m/s. Results are presented graphically, showing the suction bending radius take 50 mm is more appropriate. It is shown that the diffusion tube slows the sample flow from 40 m/s of the airspeed of the aircraft to approximately 5 m/s. It is suggested that CFD simulation can be useful for improving the optimum aircraft-carried aerosol sampling inlet.

The Technical Analysis of Energy Saving and Emission Reducing in China’s Iron and Steel Industry Based on LEAP Mode

To assess some technologies which are more appropriate for the development of the iron and steel industry in China, a model was developed based on the Long range Energy Alternatives Planning System (LEAP) to assess the energy saving and CO2 reduction potentials from 2010 to 2040. The results show that the top three saving energy potentials is non-blast furnace iron-making accounted for 6.85%, device enlargement for 5.85%, advanced blast furnace for 4.84%, and also show that the top three CO2 reduction potentials is device enlargement accounted for 11.7%, non-blast furnace iron-making for 6.21%, advanced coke and blast furnace 5.52%. In the Mitigation scenario, it can reduce 28% of the initial energy demand and 35.2% of CO2 emissions. It can provide a method and data for search energy saving and CO2 reduction potentials in iron and steel industry by LEAP model.