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Alternate Inlet Guide Vane Swirl Mechanism

IP.com Disclosure Number: IPCOM000243878D
Publication Date: 2015-Oct-26
Document File: 5 page(s) / 300K

Publishing Venue

The IP.com Prior Art Database

Related People

Nagaparthy H K: INVENTOR [+4]

Abstract

Movable inlet guide vanes are used to adjust the angle of incoming air to enhance the performance of a rotating machine The inlet guide vanes are moved in a synchronized manner using an actuating cylinder connected to the vanes through linkages The problem associated with the current system is that it is very complex bulky and costly This paper proposes an alternate swirl mechanism for inlet guide vanes which is easy to manufacture easy to assemble and has low cost Additionally it provides the flexibility to control each vane independently by providing an electrical feedback to the actuating cylinder of the corresponding vane In the proposed design movement of each vane is controlled by a helical cam profile in a rotary joint The present design can be incorporated for numerous applications as in internal guide vanes which needs stage adjustment to improve the aerodynamic performance

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Page 01 of 5

Alternate Inlet Guide Vane Swirl Mechanism

Nagaparthy H K, Jagadeesh Hariwal, David Antony and Vikram Mysore Subash

ABSTRACT

Movable inlet guide vanes are used to adjust the angle of incoming air to enhance the performance of a rotating machine. The inlet guide vanes are moved in a synchronized manner using an actuating cylinder connected to the vanes through linkages. The problem associated with the current system is that it is very complex, bulky and costly. This paper proposes an alternate swirl mechanism for inlet guide vanes which is easy to manufacture, easy to assemble and has low cost. Additionally, it provides the flexibility to control each vane independently by providing an electrical feedback to the actuating cylinder of the corresponding vane. In the proposed design, movement of each vane is controlled by a helical cam profile in a rotary joint. The present design can be incorporated for numerous applications as in internal guide vanes, which needs stage adjustment to improve the aerodynamic performance.


1. Introduction

Inlet Guide Vanes (IGV) are placed in front of a rotary machine to guide the inlet air into a first stage. The purpose of the IGVs is to adjust the stage's aerodynamic performance by directing the inlet air into the rotary machine at a proper angle. The IGVs could be fixed or variable to operate on wide ranges of angle. The variable IGVs also help to maintain the desired discharge pressure and the performance characteristics of the rotating machine by adjusting the mass flow rate of the inlet air.


Page 02 of 5

The IGVs are usually moved in a synchronized way to alter the direction of the incoming air. In this type of arrangement, each vane is connected to a single actuator through linkages. This makes the system very complex and costly, and also increases the wear and tear in the system as the number of the linkages increase. Another drawback of this system is that it requires a large actuating cylinder- piston arrangement or electric motor to actuate the vane assembly.

Hence, there is a need for a system that addresses the above-mentioned limitations of the present IGVs swirl mechanism which can be easy to implement and economical.


2. Solution

The proposed system addresses the abovementioned limitations of existing systems by proposing an additional concept for the swirl mechanism in addition to prior art that is easy to assemble and economical. Furthermore, it has a flexibility to add an independent control of each vane to distribute the load of the incoming air on a rotor assembly based on the system requirement. This can be achieved by controlling the swirl of each vane independently by tapping electrical induction feedbacks for each actuating cylinder attached to the vane.

Figure 1 shows an example of a proposed inlet guide vane swirl mechanism. In the proposed system, each vane is considered as an independent assembly. The movement of each vane can be controlled independently or in the synchroni...