Study On A Method Of Aeration With High Oxygen Increase,Low Temperature Rise And Maintaining Water Stratification

As a method of improving stratified water body,pressurized water aeration has been applied in many aspects,such as lakes and reservoirs.It has many advantages,such as convenient operation,wide use and high efficiency.Taking this as the object,this paper explores the comprehensive indexes of oxygen increasing efficiency,heating degree and water stratification characteristics,so as to find a balance point and make it achieve the best work efficiency.The main research method is to combine experiment with simulation.By changing one or more parameters,such as flow rate,time and depth in aeration,the temperature field,flow field and dissolved oxygen content in water are observed.Many methods are used in the experiment,including control variable method,comparison method,single parameter change and so on.Through repeated experiments under multi-dimensional and multi working conditions,the variation rules and characteristics of dissolved oxygen content,velocity field and temperature field in water flow are explored.The relationship between aeration parameters and the temperature rise and dissolved oxygen increment in the constant temperature layer was established,and the heating and oxygen increasing effects of pressurized water aeration were explored.Finally,a theoretical method of pressurized water aeration with low temperature rise,high oxygen increasing efficiency,no stirring of sediment and maintaining water stratification is extracted,which provides a theoretical basis for the implementation of aeration and other related projects.The details are as follows:In the first chapter,we study and study the subject in the early stage,including the use of the current mainstream aeration methods and the principle of aeration.Through the existing deficiencies,put forward their own solutions,that is,the research content and ideas of this paper.In the second chapter,The equipment used in the experiment is briefly introduced,and the PIV test system is also described in detail.In the third chapter,The flow field and velocity field are explored by experiment,and the characteristics of different conditions are compared,and the change law of velocity field is explored.In the fourth chapter,the characteristics of temperature field are studied experimentally.Different directions(horizontal and vertical directions)and different flow rates in static and dynamic experiments are explored in detail.It is a good foundation for the later study of DO content.In the fifth chapter,The temperature field and velocity field are simulated.Compare the result value with the experimental value to verify the accuracy of the experiment.Through the reference function of the simulation value,the experiment is further modified and improved.The sixth chapter is the exploration of pressurized water aeration method.The key point is the measurement of DO content,which is also the core content of this subject.Based on the analysis and comparison of the results in different experimental groups,an optimal aeration method with high oxygenation efficiency,low temperature rise and maintaining water stratification was extracted.The seventh chapter summarizes the main idea and points out the shortcomings.