Table 1 List of Symbols

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Section 1: Introduction

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Aero-Acoustics Test Programs

Section 2: Description of Test Programs

Table 1

List of Symbols

Area - ft.2-

A+A,

Augmenter cross-sectional area

A+door,

Hush-House door outlet flow area

A+encl eff,

Enclosure effective flow area (A+door, in hush-house

case)

A+1+net,,

Hush-House door inlet minimum flow area

A+2+net,,

Hush-House secondary inlet minimum flow area

A+NT,(A+8,)

Engine nozzle throat area (total area at maximum power)

AIRCR

Aircraft

AUGM

Augmenter

Bar

Barometric pressure - inches of mercury absolute

C+P+air,,

Constant pressure specific heat of air - Btu/lb deg. F

C+P+E,,

Constant pressure specific heat of engine exhaust -

Btu/lb deg. F

C+P+augm exh,,

Constant pressure specific heat of mixed flow leaving the

augmenter - Btu/lb deg. F

D+NT,

Engine nozzle throat diameter

Exhaust nozzle pressure ratio (P+T+N(8),,/Bar)

E.P.R.

Acceleration of gravity at sea level - 32.2 ft/sec.2-

Static pressure - psi, inches of water, etc.

P+encl,

Hush-House enclosure internal pressure

P+1,

Static pressure at door inlet minimum area

P+2,

Static pressure at secondary inlet minimum area

P+T+N,,(P+T+8,,)

Exhaust nozzle total pressure

P+T,

Stagnation pressure or total pressure

Dynamic pressure (1/2 +p,v.2-)

T or Temp

Temperature - deg. F or deg. R

T+amb,

Ambient air temperature

T+p,

Augmenter wall temperature parameter,

T+p, = (T+wall, - T+amb,)/(T+T+N,, - T+amb,)

(dimensionless)

T+wall,

Augmenter wall temperature

T+T,

Stagnation temperature or total temperature

T+T+N,, (T+T+8,,)

Engine nozzle exit total temperature

Velocity - ft/sec

V+exit,

Augmenter exit velocity - ft/sec

V+inlet,

Velocity at door inlet minimum area - ft/sec

V+interior,

Velocity approaching aircraft inside of hush-house

or V+int,

Mass flow rate - lbm/sec

W+engine,

Total engine mass flow rate - lbm/sec

or W+E,

W+1,

Door inlet mass flow rate - lbm/sec

W+2,

Secondary inlet mass flow rate - lbm/sec

W+IT,

Total inlet mass flow rate - lbm/sec

Air density - slugs/ft.3-

Y+ctr,

Lateral distance from augmenter centerline to augmenter

wall - ft

Y+p,

Lateral offset parameter, Y+p, = (Y+ctr, - Y)/Y+ctr,

(dimensionless)