The most important form of loss of energy in long-distance gas pipelines was turbulence resistance. In order to study the V-shaped riblet influence on the resistance in the gas pipeline, this paper used the software of CFD to simulate two different geometric size of V-shaped riblets and smooth pipe. The Reynolds number was 74 880. By analyzing the flow field in the pipeline, the distribution of vorticity and wall shear stress, the reasons for increasing drag and decreasing resistance were found. Based on this, the drag reduction mechanism was obtained. The results showed that：compared with the smooth gas transmission pipeline，when the riblet size in the pipeline was s ⁺=22, the flow velocity, vorticity value, the area of wall shear stress and the shear stress were small. Riblet had the effect of drag reduction. When the riblet size of the pipeline was s ⁺=44, the flow velocity of the near wall area, the vorticity value at the top of the riblet, the wall shear stress increased area and the shear stress value was large. Riblet had the effect of increasing resistance.

According to the background of views on further strengthening of the urban planning and construction promulgated by the state council, the new open area of the status quo was explored at home and abroad in recent years. And four typical residential areas in A city were taken as examples, combined with investigation in A city, and the pros and cons of the open area were preliminary analyzed. And by using the simulation software to simulate plot open, a variety of factors under the condition of MATLAB mathematical model was established. And before and after the impacts on the surrounding area in the open were quantitatively compared. According to the results, and puts forward the following suggestions: Building the open district should adhere to the peoplecentered principle, should from the laws and regulations, regulatory system, social environment and other aspects to obtain, reasonable planning and construction of the community. The results can provide reference for the construction and management of open community in A city of liaoning province.

Based on the mechanism of coalbed methane recovery by CO2 injection, starting from the experiments simulation studies and production practice, the influence factors of coalbed methane recovery by CO2 injection was analyzed. The study found that the main influence factors were as followings: the conditions of coal quality, water, injection pressure and rate of CO2.The gas injection process was affected by the different types, contents and distribution characteristics of the minerals in the coal and the water in the coal seam. Without external water supply in the state of free water, the higher content of carbonate mineral in coal was, the higher coalbed methane recovery was. The higher the gas injection pressure was, the better coalbed methane seepage channel output was. In a certain time, the methane stripping ratio increased with the increase rate of CO2 injection. By using analytic hierarchy process on the sensitivity analysis of the different factors, the results showed that the weighting coefficient of coal quality conditions was 0.55. Coal quality condition played a main role in the process of gas injection.