A modern gas turbine engine, in the layout of designed aircraft, allows us to consider fundamentally different placement options. The contradictory influence type, number and location engines on safety efficiency flight leads need study these tasks at early stages design. This article discusses an approach determining optimal position by wingspan stage preliminary calculation features consist t...

There are a number of systems in which supercritical cryogenic fluids are used as coolants or propellant fluids. In some modern military aircraft, the fuel is pressurized above its critical point and used as a coolant to remove heat from the aircraft engine. Accurate prediction of heat transfer coefficients to turbulent flows of supercritical fluids is essential in design of such systems. One o...

The present paper deals with the preliminary design of a general aviation Commuter 11 seat aircraft. The Commuter aircraft market is today characterized by very few new models and the majority of aircraft in operation belonging to this category are older than 35 years. Tecnam Aircraft Industries and the Department of Aerospace Engineering (DIAS) of the University of Naples "Federico II" are dee...

The flight envelope can be viewed as a set within the state space of an aircraft. For various safety considerations an aircraft is required to remain within its prescribed flight envelope. The safe set is the largest controlled invariant set within the flight envelope. Thus, if an aircraft is to remain within its envelope it must stay within the safe set. When an aircraft is impaired, e.g., a j...

Acoustics measurements of a Pratt & Whitney full-scale ADP (Advanced Ducted Propulsor), an ultrahigh by-pass ratio engine, were conducted in the NASA Ames 40by 80-Foot Wind Tunnel. This paper presents data from measurements taken from sensors on a fan exit guide vane in the ADP. Data from two sensors, one at mid-span and the other at the tip of the fan exit guide vane, are presented. At the bla...

Hybrid electric propulsion is a promising solution to reduce aircraft emissions, thus improving the sustainability of air transport. In this work, hybrid configuration with rear-mounted boundary layer ingestion (BLI) engine has been investigated. The partial embedding into fuselage generates distortion ingested inflow causing additional tonal and broadband BLI noise sources, and, at same time, ...

With the rapid development of world economy and technology, engine technology has made a series progress in aerospace field. However, problems environmental pollution energy crisis are becoming more serious. The advanced aircraft engines can contribute to thrust-to-weight ratio, fuel consumption rate, lifetime cost, pollutant emission, safety reliability, etc., reducing flight costs. This paper...

Noise could occur anywhere in the aerospace and other fields has a great influence on operation of aircraft. The control sound emission attracted lot attention from economic environmental aspects. Firstly, noise is annoying for passengers pilot may increase risk to be exposed military applications. Secondly, pose damage threat engine equipment due strong pressure oscillation. In addition, combu...