Polarization Band Effect and MEMS-Based Plasma Generation

We find that effects resulting from micro/nano scale structures can regulate space charges which excite and lead to the special electric field distribution featuring the flux convergence band structure. It is here referred to as the polarization band effect, which stems from the specific field-induced interactions among atoms and molecules. The micro/nanoelectrode array structures were designed and fabricated using the non-silicon micro/nano processing technology, forming micro/nano electrode arrays-based plasma microelectromechanical systems(NPMEMS). The integrated NPMEMS device can be used to regulate the inner energy states of matters and generate plasma based on the polarization band effect, all within a single chip-size limited local area or extending into a large volume space with the deployment of a distributed array of multiple devices. Its special physical and chemical properties can be utilized to greatly improve the efficiency of potential application systems or solve mechanism-level challenges in plasma-related applications of multiple fields.

Application of UG Software in Mechanical Design

UG software is powerful,and has been widely applied in machine design.The following is an analysis of the development of UG software.It also analyzes the characteristics of use and analyzes the specific application,hoping to give some references to the people concerned.

Flamelet-like models applied in scramjet combustors:A state of art and prospect

Developing supersonic combustion models with efficiency,accuracy and practicality is important foundation to deeply understand the complex combustion processes in scramjet engines.Characterized by efficiency and intuition,the flamelet-like models are widely used models in computational combustion methods.However,the supersonic combustion flow field has the nature of strong compressibility,multiple modality,and multiple scales,which poses a great challenge to the traditional flamelet-like models with fixed boundary conditions,and then the complex chemical reaction mechanisms that may face will impose additional computational burden.In this context,this paper reviews the flamelet-like models used in scramjet engines,and summarizes prominent issues in the application practice,including modeling partially premixed combustion,defining progress variable,solving temperature efficiently,evaluating assumed Probability Density Function(PDF)models,and treating mixture fraction variance.Furthermore,possible prospects and directions of improvements are proposed and highlighted for the flamelet-like models.To fully describe the physicochemical scenario and address the raised challenges,these improvements are dedicated to dealing with the compressibility,temperature rise,time-scales,species of interest,multi-inlet combustion,the progress variable definition,and the higher Mach number flight condition.