Centrifugal compressors are widely used in many industrial fields such as automotive, aviation, aerospace. However, these turbomachines suffer instability phenomenon when the flow rate is too high or low, called rotating stall and surge. These phenomena cause operation failure, pressure fluctuations vibrations of thorough system. Numerous mechanical solutions have been presented to minimize ins...

A pump is a machine or device that raises liquid from low surface to higher moves low-pressure high-pressure area. centrifugal equipment used provide energy fluid (liquid) based on the force generated by rotating impeller. So can be moved one place another. As it receives through impeller, velocity will increase. This kinetic then converted into compressive housing (casing) in form of spiral (v...

Well "X-01" is a slant (J-Type) directional well and will be subjected to appropriate technically qualified drilling casing planning in order prevent problems such as burst, collapse, tension that can cause increased internal external pressure loads experienced by the casing. The methodology used this research document study quantitative analysis using Drilling Software taking into account load...

On many occasions, fan or compressor stages have to face azimuthal flow distortion at inlet, which affects their performance and stability. These distortions can be caused by external events some particular geometrical features. The aim of this work is propose a joined numerical experimental analysis the behavior in single axial stage under distortion. are generated different grids that placed ...

The aim of this study was to analyze yields, biological efficiency, earliness (expressed as days to first harvest), and precociousness and establish models for the mushroom growing according to these parameters. The experiment followed a double factorial design with four sources of calcium (calcitic limestone, calcitic limestone + gypsum, dolomitic limestone and dolomitic limestone + gypsum) an...

Hydraulic turbines exhibit total load rejection during operation because of high fluctuations in the grid parameters. The generator reaches no-load instantly. Consequently, the turbine runner accelerates to high speed, runaway speed, in seconds. Under common conditions, stable runaway is only reached if after a load rejection, the control and protection mechanisms both fail and the guide vanes ...

A low-speed counter-rotating axial flow compressor (CRAC) with single circumferential grooved casing treatment (CT) was investigated numerically. Both steady and time-accurate numerical calculations were performed to study the effects of the single grooved CTs over the rear rotor on the stability enhancement and the unsteadiness of tip leakage flow (TLF) in the CRAC. Parametric studies indicate...

Hydropower plays a key role in the actual energy market due to its fast response and regulation capacity. In that way, hydraulic turbines are increasingly demanded to work at off-design conditions, where complex flow patterns and cavitation appear, especially in Francis turbines. The draft tube cavitation surge is a hydraulic phenomenon that appears in Francis turbines below and above its Best ...

Sound emissions of an automotive engine cooling system are studied using both single-microphone directivity measurements and a rotating beamforming technique. These provide reference acoustic data on such some new understanding the effect that radiator induces distribution sound sources. Indeed, results indicate that, above frequency limit allowed by Rayleigh criterion, it is possible to locali...

casing soil is one of the most important indicators of button mushroom production, which has a direct impact on the size and performance. due to the easy availability of resources for the production of vermicompost this mix can be used alternative of peat to button mushroom production. this study was conducted with nine treatments and three replications in¬¬ a completely randomized design at th...