The Ejector Burner Optimized Design Research

The structure of ejector is simple and easy to manufacture. It is convenient to operate and thus has been widely used in cooling, aerospace application, light chemical engineering, and other industrial applications. For the complex flow field of ejector, experimental study has its limitations. With the continuous development of computer skills and the innovation of fluid dynamics, it can use numerical simulation accurate simulation the complex flow field of ejector, which has important significance for ejector optimization design.First, we introduce research background and current situation, determine the research methods and content; Secondly, we calculate the ejector burners basic dimensions; Once again, we introduce the software Fluent; At last, we use Fluent to simulation the ejector burner, calculate the ejector burner velocity distribution, the operating flow, the ejected mass flow, study the main factors affecting the ejector burner. Study the geometric parameters (the equivalent diameter ratio of ejected inlet and nozzle inlet; outlet diameter; the position of nozzle; the diameter of nozzle; the throat diameter of primary nozzle; the ratio of throat length and the diffuser chamber length) and the operating parameters (operating pressure; ejected pressure; ejector backpressure). The main results show that:Under the same operating parameters of ejector burner, the geometric parameters that impact for ejector burner as follows:l.When the equivalent diameter ratio less than0.6, with the increase of the equivalent diameter ratio, the ejecting coefficient increased; When the equivalent diameter ratio greater than0.6, the ejecting coefficient basically unchanged;2. With the increase of the outlet diameter, the ejecting coefficient decreased, in the end there will be a critical outlet diameter;3. With the increase of the L1/L2, i.e., the position of the nozzle away from absorption chamber entrance, the ejecting coefficient decreased;4. With the increase of the diameter of the nozzle, the ejecting coefficient decreased;5. With the increase of the diameter of the mixing chamber, the ejecting coefficient decreased;6. With the increase of the ratio of throat length and the diffuser chamber length, the ejecting coefficient increased;Under the same geometric parameters of ejector burner, the operating parameters that impact for ejector burner as follows:1. With increase of the operating pressure, ejected mass flow almost remained the same, but the mass flow of the operating fluid continued to increase, which resulted in the continuous decrease of the ejecting coefficient;2. With the increase of the ejected pressure, both ejecting coefficient and ejected mass flow increased;3. With the increase of the ejecting backpressure, both ejecting coefficient and ejected mass flow decreased. Furthermore, with larger equivalent diameter ratio, the rate of decreasing was larger.