1 Overview
The MISES system is a collection of programs for cascade analysis and design. This includes
programs for grid generation and initialization, flow analysis, plotting and interpretation of
results, and an interactive p rogram to specify design conditions.
The block diagram for these programs is given at the end of this manual. The basic grid and
flow data file for a case is the so-called state file named idat.xxx, where “xxx” is an extension
suffix used to designate the case being run. The state file is initialized using ISET from the
blade geometry file blade.xxx and the optional stream surface geometry file stream.xxx and
the prescrib ed loss s chedule file loss.xxx. The flow solver ISES uses th e state file and a flow
condition file ises.xxx that specifies the flow conditions and program configuration flags. The
POLAR program performs the same calculations as ISES , but for a set of specified parameters.
Additional design condition information can be interactively added to the state file using the
EDP pressure edit program. The IPLOT program plots the flow and geometry data from the
state file in an interactive p lotting session.
2 Internal Reference Quantities
All flow variables used by MISES are defined in the relative frame. Internally, MISES employ s
rotation-corrected stagnation density and speed of soun d, ρ
o
a
, a
o
a
, as the basic reference flow
variables, so that ρ
o
a
= 1 an d a
o
a
= 1 by definition. The corresponding rotation-corrected
stagnation pressure p
o
a
and enthalpy h
o
a
≡ I (i.e. rothalpy) are then related as follows .
γ p
o
a
= ρ
o
a
a
o
2
a
= (γ − 1) ρ
o
a
I
The Fortran names and assigned values of the internal reference quantities are ρ
o
a
= RSTR0 = 1,
and I = HSTR0 = 1/(γ −1). Normally, these are not of concern for the user, since all inp ut
and output is typically done via ratios and related dimensionless qu antities, following common
conventions. For example, the outlet pressure is specified as p
2
/p
o
1
, where p
o
1
is the conventional
relative-frame total pressure at the inlet at the specified radius r
1
.
The ( )
o
a
notation means an “absolute” total quantity (not to be confused with an absolute-
frame total quantity), in the sense that it implies an isentropic process where the fluid is brought
to rest in the relative frame, and taken to the rotation center r = 0. Bringing the fluid to rest
in the relative frame at a fixed radius r gives the conventional stagnation quantities ρ
o
, a
o
,
etc. The absolute and conventional stagnation quantities are related by the usual isentropic
relations.
p
o
p
o
a
=
I + Ω
2
r
2
/2
I
!
γ
γ−1
ρ
o
ρ
o
a
=
I + Ω
2
r
2
/2
I
!
1
γ−1
a
2
o
a
o
2
a
=
I + Ω
2
r
2
/2
I
4