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naca-wr-e-36

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Effect of Several Methods of Increasing Knock-Limited Power on Cylinder Temperatures

In evaluation of each of these six conditions on the basis of
engine knock, consideration must be given to their effect on cyl-
inder temperatures at knock—limited power. Two sets of cylinder
temperatures are of interest - external and internal. Tie external
temperatures are used in flight to determine whether the engine is
adequately cooled. The limiting values of these temperatures are
based on the manufacturer's specifications for safe operation of
the engine. Certain internal cylinder temperatures, namely, the
exhaust valve (reference 1) and the spark-plug electrodes bear no
direct relationship to the external cylinder temperatures. These
temperatures are important because of their relationship to engine
durability and because they are potential sources of preignition
if the temperatures are not adequately controlled. Data on the
relation of cylinder~head temperatures to knock-limited power have
been presented to the Coordinating Research Council by Pratt &
Whitney.Aircraft Corporation. The effects of internal coolants on
knock-limited and temperature-limited power are given in reference 2.

In the present report, tests are described in which the knock-
limited power was determined as a function of each of the previously
listed six engine conditions. For each test the following tempera-
tures are presented: rear spark—plug bushing, middle rear barrle,
exhaust—valve crown, front sparkvplug electrode, rear sparkhplug
electrode, and exhaust gas.

This inyestigation was conducted in.chember 1943 at the
Aircraft Engine Research.Laboratory of the NACA at Cleveland, Ohio.

The data for this report were obtained on a wright R—ZBOO~8
front—row cylinder fitted with standard baffles and mounted on a
CUE crankcase (figs. 1 and 2). A Stancal pickup unit and an oscil-
lograph were used for indication of knock.

The cylinder temperatures were measured by thermocouples
located as shown in figure 5. Only the temperatures listed in the
preceding section are presented because they are considered to
represent the critical locations.

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naca-wr-e-36

  • Version
  • 12 Downloads
  • 1,013.98 KB File Size
  • 1 File Count
  • April 15, 2017 Create Date
  • April 15, 2017 Last Updated
Scroll for Details

Effect of Several Methods of Increasing Knock-Limited Power on Cylinder Temperatures

In evaluation of each of these six conditions on the basis of
engine knock, consideration must be given to their effect on cyl-
inder temperatures at knock—limited power. Two sets of cylinder
temperatures are of interest - external and internal. Tie external
temperatures are used in flight to determine whether the engine is
adequately cooled. The limiting values of these temperatures are
based on the manufacturer's specifications for safe operation of
the engine. Certain internal cylinder temperatures, namely, the
exhaust valve (reference 1) and the spark-plug electrodes bear no
direct relationship to the external cylinder temperatures. These
temperatures are important because of their relationship to engine
durability and because they are potential sources of preignition
if the temperatures are not adequately controlled. Data on the
relation of cylinder~head temperatures to knock-limited power have
been presented to the Coordinating Research Council by Pratt &
Whitney.Aircraft Corporation. The effects of internal coolants on
knock-limited and temperature-limited power are given in reference 2.

In the present report, tests are described in which the knock-
limited power was determined as a function of each of the previously
listed six engine conditions. For each test the following tempera-
tures are presented: rear spark—plug bushing, middle rear barrle,
exhaust—valve crown, front sparkvplug electrode, rear sparkhplug
electrode, and exhaust gas.

This inyestigation was conducted in.chember 1943 at the
Aircraft Engine Research.Laboratory of the NACA at Cleveland, Ohio.

The data for this report were obtained on a wright R—ZBOO~8
front—row cylinder fitted with standard baffles and mounted on a
CUE crankcase (figs. 1 and 2). A Stancal pickup unit and an oscil-
lograph were used for indication of knock.

The cylinder temperatures were measured by thermocouples
located as shown in figure 5. Only the temperatures listed in the
preceding section are presented because they are considered to
represent the critical locations.

FileAction
naca-wr-e-36 Effect of Several Methods of Increasing Knock-Limited Power on Cylinder Temperatures.pdfDownload 
17,003 Documents in our Technical Library
1344564 Total Downloads

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Newest Additions

ADPO10769 Occurrence of Corrosion in Airframes
The purpose of this lecture is to provide an overview ...
MIL-STD-1759 Rivets and Rivet Type Fasteners Preferred for Design
The purpose of this book form standard is to provide ...
MIL-STD-810G Environmental Engineering Considerations and Laboratory Tests
This standard contains materiel acquisition program planning and engineering direction ...
MIL-R-7885D General Specification for Rivets, Blind, Structural, Mechanically Locked Spindle and Friction Locked Spindle
This specification covers mechanically locked spindle and  friction locked spindle ...
MIL-HDBK-132A Protective Finishes for Metal and Wood Surfaces
The primary object of this handbook is to provide a ...