| With the development of the times,the extensive use of high performance ships in military and civil fields has attracted more and more countries’ attention.Therefore,the integrated operation system of ships,carrier-borne aircraft and transport boats has played a great role in various offshore operations.Ship deck is the helicopter platform at sea with great environmental effects.Study on carrier-based helicopter and related technology started late in our country.Therefore,it is necessary to study the ship deck,coupling superstructure,navigational conditions,and taking into account the safety of helicopter take-off and landing.In order to provide technical support for helicopter take-off and landing safety assessment,the distribution of air flow and temperature field on the deck under different environments and navigational conditions should be analyzed in detail.Numerical simulation is adopted in this thesis to study the influence of temperature and airflow field on Tarawa amphibious assault ship deck under different wind directions and speeds.Firstly,the numerical simulation calculation method and the solution scheme are introduced,and the reliability of the calculation method is verified.Secondly,the temperature field above the vessel is analyzed under different navigational conditions.Results show that with the increase of wind angle,the high-temperature smoke discharged from the chimney will gradually deviate to one side of the tarmac of the deck.When the wind direction reaches an angle(which is related to wind speed),the high-temperature smoke starts to skim over the ship side of the ship’s leeward side.At lower wind direction angle(less than or equal to 30°),the 5th and 6th apron is influenced by flue gas significantly.When the wind direction angle increases to 40°,impact of the 4th apron will increase gradually.Finally,the airflow effects on the ship deck under different navigational conditions are analyzed.Results show that under any wind direction with 10～23m/s,there is always a local eddy zone formed by the blunt body at the end of the deck,which leads to the over-limit area of local turbulent kinetic energy.Under the same wind direction Angle,the influence range of turbulent kinetic energy over-limit zone is positively correlated with wind speed.The essential reason for the formation of turbulent kinetic energy over-limit zone is the exchange of momentum between flows. |
