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Alvi
Farrukh S. Alvi, Tallahassee, FL US
| Patent application number | Description | Published |
|---|---|---|
| 20090261206 | Method of using microjet actuators for the control of flow separation and distortion - A system for controlling unwanted flow separation. One or more microjets are placed to feed auxiliary fluid into a region of suspected flow separation. If the separation is intermittent, sensors can be employed to detect its onset. Once separation is developing, the microjets are activated to inject a stream of fluid into the separation region. This injected fluid affects the flow and serves to control the flow separation. A steady-state embodiment can be used to continuously fluid. On the other hand, sensors and a rapidly reactive control circuit can be used to inject fluid only when it is needed to inhibit flow separation. The sensors and control circuit can operate off of simple pressure gradient detection or predictive algorithms that anticipate when flow separation will occur. | 10-22-2009 |
| 20090288711 | Microjet creation and control of shock waves - A method of using one or more microjets to create and/or control oblique shock waves. The introduction of microjet flow into a supersonic stream creates an oblique shock wave. This wave can be strengthened—by increasing microjet flow rate or the use of many microjets in an array—in order to form an oblique shock. Such an oblique shock can be used to decelerate flow in a jet aircraft engine inlet in a controlled fashion, thus increasing pressure recovery and engine efficiency while reducing flow instability. Adjusting the pressure ratio across the microjet actually alters the angle of the oblique shock. Thus, the use of microjets allows decelerating shock waves in an inlet engine to be properly positioned and controlled. Microjet arrays can also be used to ameliorate shock waves created by external aircraft surfaces, such as sensor pods and weapons. Microjets placed forward of any external protuberance can convert a single substantial shock wave into a series of much milder waves which will not produce unwanted external effects, such as strong sonic booms. | 11-26-2009 |
| 20100282858 | High bandwidth micro-actuators for active flow control - A high bandwidth multi-stage microjet actuator. The actuator can produce relatively large amplitude flow disturbances over a broad range of frequencies. The disturbance frequency can be varied by altering the geometry of the device, altering the pressure ratio(s) within the device, and combinations of the two. The actuator has many potential applications, including noise abatement for jet aircraft, and flow control over a moving airfoil. | 11-11-2010 |
| 20110203673 | Microjet Control for Flow & Noise Reduction in Automotive Applications - The present invention comprises a method and associated devices for reducing the noise produced by an open cavity within a moving automobile (such as open sunroofs and open windows). The invention proposes placing microjet orifices proximate the open cavity. These inject small but rapidly moving columns of air into the prevailing flow. The projected columns reduce the formation of large coherent structures in the prevailing flow. As these large coherent structures are a critical component of the resonance which is responsible for much of the noise produced across the open cavity, the overall noise level is reduced by the microjets. | 08-25-2011 |
| 20110232792 | High Frequency Pulsed Microjet Actuation - An actuator configured to rapidly vary the throat geometry of a microjet nozzle. Varying the throat geometry rapidly changes the characteristics of the microjet produced by the microjet nozzle. The inventive device is capable of producing pulsed flow. In some embodiments it is also capable of producing rapidly variable flow in order to provide active control. | 09-29-2011 |
Khisal Ahmed Alvi, San Diego, CA US
| Patent application number | Description | Published |
|---|---|---|
| 20110288121 | Processes for Producing Modulators of Cystic Fibrosis Transmembrane Conductance Regulator - The present invention relates to the process for producing modulators of cystic fibrosis transmembrane conductance regulator (CFTR). | 11-24-2011 |
Yousra Yousaf Alvi, Islamabad PK
| Patent application number | Description | Published |
|---|---|---|
| 20110229105 | DECENTRALIZED SYMMETRIC NETWORK OF AUTONOMOUS DIGITAL VIDEO RECORDERS AND ITS METHOD OF USE - The present invention describes a decentralized symmetric configuration of digital video recorders (DVCRs) for monitoring, controlling, analyzing, recording, playback and streaming of audio/visual (A/V) media over a network. Each DVCR is an autonomous device able to operate in its local environment as well as access and operate another DVCR available on the network to facilitate the overall working of the disclosed system. Each DVCR also exhibits storage fail-safe feature whereby it recovers data automatically if storage media gets corrupted such as due to sudden power failure. A DVCR can be configured to scan the network for other DVCR units. A list of discovered DVCRs is displayed. Each DVCR can access, after authentication, any of the listed DVCR for configuration, monitoring, controlling, recording, playback and other available functionality over the network. The same controls used for operating a local DVCR, including use of buttons, can be employed to operate the remote DVCR, giving a virtual presence at the remote location. The functionality exhibited by each of the DVCR, can be identical. A plurality of the DVCR can thus form a decentralized, symmetric network in which there is no master or central controller. | 09-22-2011 |