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Improved Experimental Arrangement to Assess Targeting in Bird Ingestion Testing of Turbofans

IP.com Disclosure Number: IPCOM000247722D
Publication Date: 2016-Sep-30
Document File: 6 page(s) / 473K

Publishing Venue

The IP.com Prior Art Database

Related People

Costas Vogiatzis: INVENTOR [+2]

Abstract

Aircraft manufacturers as well as Jet engine manufacturers perform Bird Ingestion Testing for certification purposes. A real bird is fired from an air cannon onto a precise location along the span of a fan of a turbofan engine. The location along the span of fan is of importance and hence the precision of targeting gun is determined well before conducting the test. Trial shots are performed to estimate the precision of the air cannon. Estimation of the air cannon precision using this method is not adequate. This paper discuss a method to assess precision of an air cannon using a modified target. The modified target comprises of a set of buckets arranged in an array. The set of buckets receive bird material fired from the air cannon. From the co-ordinates of each bucket and the amount of bird debris in each bucket, the center of mass of the bird is estimated. Using the location of center of mass, the precision of the air cannon can be determined.

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Page 01 of 6

Improved Experimental Arrangement to Assess Targeting in Bird Ingestion Testing of Turbofans

Costas Vogiatzis, Tirumala Rao Koka

ABSTRACT

Aircraft manufacturers as well as Jet engine manufacturers perform Bird Ingestion Testing for certification purposes. A real bird is fired from an air cannon onto a precise location along the span of a fan of a turbofan engine. The location along the span of fan is of importance and hence the precision of targeting gun is determined well before conducting the test. Trial shots are performed to estimate the precision of the air cannon. Estimation of the air cannon precision using this method is not adequate. This paper discuss a method to assess precision of an air cannon using a modified target. The modified target comprises of a set of buckets arranged in an array. The set of buckets receive bird material fired from the air cannon. From the co-ordinates of each bucket and the amount of bird debris in each bucket, the center of mass of the bird is estimated. Using the location of center of mass, the precision of the air cannon can be determined.


1. INTRODUCTION

Bird strikes are a threat to aviation industry ever since 1905. It is a common threat to any aircraft flying in low altitudes. The encounter with flocks of birds can damage the aircraft and make it unreliable for further flight. The current aircraft certification standards require the aircraft structure as well as the propulsion engine to sustain a bird strike.

These norms and regulations lead aircraft manufacturers to conduct bird ingestion test. The bird is fired from an air cannon to hit a precise location along the span of the fan blades. Since the location of impact is of high significance, the accuracy of air cannon is to be determined before conducting the test. In order to assess the accuracy of the air cannon, trial shots are conducted to determine the mass distribution in space and position of the center of mass of the impacting bird material.


Page 02 of 6

Prior method involve firing the bird from an air cannon onto a thin metal plate target. The metal plate deforms or breaks when impacted with the bird material. The maximum deformed point is considered as the impact point. The center of mass of material is determined by identifying the position of maximum deformed point. However it is found that the maximum deformed point may not be the location of center of mass of the bird material. The jet engine manufacturers demand an improved method to estimate the accuracy of air cannon.

This paper describes a method for determining the position of center of mass of the bird material fired from an air cannon precisely in comparison to the prior methods.


2. PROPOSED SOLUTION OF THE PROBLEM

The present paper proposes an improved method to determine the accuracy of the air cannon by estimating the center of mass of the bird material fired onto a modified target. The bird is fired from the air cannon onto the modified target which is a coll...