نتایج جستجو برای: swirl ratio
تعداد نتایج: 503693 فیلتر نتایج به سال:
The potential of Palm Methyl Esters (PME) as an alternative fuel for gas turbines is investigated using a swirl burner. The main air flow is preheated to 623 K and a swirling spray flame is established at atmospheric pressure. The spray combustion characteristics of PME are compared to diesel and Jet-A1 fuel under the same burner power output of 6 kW. Investigation of the fuel atomizing charact...
A new turbulent, premixed, stagnation swirl flame (SSF) is used to synthesize titanium dioxide (TiO2) nanopowders. Synthesis conditions under two flame modes, i.e., burnerand substrate-stabilized SSF, are investigated, for the same equivalence ratio, but different inert-dilution ratios. The particles (collected on the substrate) have high anatase purity, with mean diameters of 5–10 nm, determin...
Gas turbine engine efficiency can be increased by the improvements of the cooling air system. In this study, gas turbine preswirl cooling system is computationally analyzed using a validated three-dimensional quasi-steady model. In the first phase of the study, the system is analyzed with respect to different operating conditions, for understanding its behavior. In this part, the dependence of ...
An investigation was carried out for swirling flow in a rotating pipe with highly viscous fluid containing micro-bubbles experimentally and numerically. In the numerical analysis, bubble trajectory of each bubble was calculated using resultant numerical flow field solutions. From experimental results, with an aid of the numerical simulation, data were obtained for the location of a stagnation p...
The present paper discusses film cooling behavior through numerical simulation in the presence of a twisted tape insert inside hole. imparts swirl to coolant flow. Coolant intensity is controlled by varying pitch resulting numbers 0.0289, 0.116, and 0.168. performance evaluated using area-averaged effectiveness heat transfer coefficient for blowing ratios 0.5, 1.0, 1.5, 2.0. Results revealed si...
Numerical investigation has been carried out on heat transfer and friction factor characteristics of copper-water nanofluid flow in a constant heat-fluxed tube with the existence of new configuration of vortex generator using Computational Fluid Dynamics (CFD) simulation. Two types of swirl flow generator: Classical twisted tape (CTT) and Parabolic-cut twisted tape (PCT) with a different twist ...
Abstract Lunar swirls are recognized as broad, bright albedo features in various regions of the Moon. These often separated by dark off-swirl lanes or terminate against background, such lunar maria. Prior mapping has been done primarily contrast, which is prone to subjectivity. Closer examination on-swirl areas shows that they not uniform, making boundary between on- and difficult map with cert...
In Sliding Vane Rotary Compressors, as well as in most of positive displacement machines, the oil is injected to accomplish sealing and lubrication purposes. However, the oil injection could produce an additional outcome during the compression phase with a great saving potential from the energetic point of view. Being the air inside the cell at a higher temperature than the oil injected, a cool...
Demand control of the air distribution systems is crucial to satisfactory thermal environment under variable heat gain conditions in an energy efficient manner. In this study, airflow patterns, ventilation performance and local comfort have been experimentally investigated mock-up meeting office rooms with a volume (VAV) system. The Active Diffuser, which had constant inlet velocity, was compar...
Abstract Boundary layer ingestion (BLI) offers potential reductions in fuel burn and emissions. The propulsive fuselage concept features an aft fan that ingests the 360 deg boundary layer. A critical condition for this configuration occurs when a sideslip angle arises between aircraft longitudinal axis freestream velocity. flow combination with airframe generates inlet distortion depends on dir...
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