The design of a rocket launch environment is complex process with many different aspects that are highly interconnected. Acoustics, which one these, should be investigated in detail due to possible devastating effects on the vehicle, crew, and environment. This study uses numerical method consider passive noise reduction applied supersonic jet impinging an inclined flame deflector decrease acou...

using of nanofluids and ducts with corrugated walls are both supposed to enhance heat transfer, by increasing the heat transfer fluid conductivity and the heat transfer area respectively. use of a diverging duct with a jet at inlet section may further increase heat transfer by creating recirculation zones inside the duct. in this work two-dimensional incompressible laminar flow of a nanofluid e...

The main objective of the thesis is to identify the primary mechanism(s) responsible for the formation of large-scale persistent flow anomalies. Towards this goal, we perform detailed synoptic and diagnostic analyses of the composite life cycles of persistent flow anomalies, focusing particularly on persistent flow anomaly (PA) development over the North Pacific and Atlantic Oceans during winte...

In this investigation our objective is 1) to compare the similitude between an unsteady, two-dimensional (axisymmetric), partially premixed  ame and an analogous steady, partially premixed  amelet to determine if state relationshipsin terms ofamodiŽ ed conserved scalar applyand2) to investigate amestructure interactionsbetween the various reaction zones contained in partially premixed  ames...

Based on the daily minimum air temperature (Tmin) data from China Meteorological Data Network and NCEP/DOE reanalysis data, intra-seasonal circulation characteristics evolution of extreme cold events (ECEs) in Northeast–North (NE-N) during winter 1979–2018 are explored, synergistic effects key systems mid-high latitude ECEs discussed. The results show that: (1) Tmin NE-N region presents a signi...

investment in oil and gas upstream activities is very important for the exploration and development of oil and gas fields. different and various laws and regulations deal with the investment in upstream operations. by reviewing these various laws and regulations, this research paper tries to discuss to what extent these laws and regulations have created legal confident for foreign investment up...

due to the importance of weed control and the limitations of mechanical methods in some places, in this research the water jet cutting for weed control was investigated. the cutting tests were performed on camel thorn weed in shahid bahonar university of kerman. the water jet pressure of 90 bars was achieved with the aid of a suitable pump. the cutting time was studied in a completely randomize...

The effect of a combined system of the bed suction and jet injection as a pier-scour countermeasure on the turbulent flow field is studied in a laboratory flume using an Acoustic Doppler Velocimeter (ADV). The three components of the velocities in the vertical symmetry plane in the equilibrium scour hole in front and rear of the pier under 3-jet injections and bed suction rate Qs/Q0 = 2%located...

Abstract Large eddy simulation is used to investigate the flashback mechanism caused by combustion-induced vortex breakdown (CIVB) in a high-pressure lean-burn annular combustor with lean direct injection of kerosene. A single sector geometry, including central pilot flame surrounded main flame, simulated at takeoff conditions. previously developed flamelet-based approach model turbulence–combu...