Reheat for Gas Turbines

1955 ◽  
Vol 59 (530) ◽  
pp. 127-150 ◽  
Author(s):  
J. L. Edwards

Some five years ago the author was privileged to deliver a Section Lecture to the Royal Aeronautical Society on the subject of reheat. The present paper attempts to summarise the problems which now arise and to give some idea of the progress which has been made in the intervening years.In 1949, reheat was in its infancy in Great Britain. A certain amount of progress had been made in the United States but the information from that source was scanty and vague. Tests at the National Gas Turbine Establishment (N.G.T.E.) had given some engine data but this was in the nature of preliminary information only and was by no means complete. In fact the majority of the problems which now beset us were then completely unknown or were considered unimportant. The N.G.T.E. work was valuable, however, in that it demonstrated the practicability of reheat, although at the time the comments of many who saw this and other schemes in operation were somewhat sceptical and definitely unflattering.

Author(s):  
Eugene F. Brady

The application of gas turbines for propulsion of navy ships for all nations continues to increase at an accelerating rate. World navies which use gas turbines include the United States, Great Britain, the Soviet Union and Japan. Therefore, a survey of the principal gas turbine applications in world navies was conducted. This survey revealed that more than 43 world navies now use gas turbines for ship propulsion. It also indicated that more than 2,700 gas turbines have been (or soon will be) installed in world navy ships. This represents a total worldwide navy application exceeding 38 million installed horsepower.


Author(s):  
John Hartranft ◽  
Bruce Thompson ◽  
Dan Groghan

Following the successful development of aircraft jet engines during World War II (WWII), the United States Navy began exploring the advantages of gas turbine engines for ship and boat propulsion. Early development soon focused on aircraft derivative (aero derivative) gas turbines for use in the United States Navy (USN) Fleet rather than engines developed specifically for marine and industrial applications due to poor results from a few of the early marine and industrial developments. Some of the new commercial jet engine powered aircraft that had emerged at the time were the Boeing 707 and the Douglas DC-8. It was from these early aircraft engine successes (both commercial and military) that engine cores such as the JT4-FT4 and others became available for USN ship and boat programs. The task of adapting the jet engine to the marine environment turned out to be a substantial task because USN ships were operated in a completely different environment than that of aircraft which caused different forms of turbine corrosion than that seen in aircraft jet engines. Furthermore, shipboard engines were expected to perform tens of thousands of hours before overhaul compared with a few thousand hours mean time between overhaul usually experienced in aircraft applications. To address the concerns of shipboard applications, standards were created for marine gas turbine shipboard qualification and installation. One of those standards was the development of a USN Standard Day for gas turbines. This paper addresses the topic of a Navy Standard Day as it relates to the introduction of marine gas turbines into the United States Navy Fleet and why it differs from other rating approaches. Lastly, this paper will address examples of issues encountered with early requirements and whether current requirements for the Navy Standard Day should be changed. Concerning other rating approaches, the paper will also address the issue of using an International Organization for Standardization, that is, an International Standard Day. It is important to address an ISO STD DAY because many original equipment manufacturers and commercial operators prefer to rate their aero derivative gas turbines based on an ISO STD DAY with no losses. The argument is that the ISO approach fully utilizes the power capability of the engine. This paper will discuss the advantages and disadvantages of the ISO STD DAY approach and how the USN STD DAY approach has benefitted the USN. For the future, with the advance of engine controllers and electronics, utilizing some of the features of an ISO STD DAY approach may be possible while maintaining the advantages of the USN STD DAY.


1946 ◽  
Vol 1946 (01) ◽  
pp. 51-57 ◽  
Author(s):  
H. Twinch

During the last twelve months short tours were made in Denmark, Canada, and the United States and certain impressions were collected, which allied to actual statistics show a picture of the present development of artificial insemination in those countries. The statistics relate mainly to a period ending in 1944, and 1945 figures are not yet available. The absence of a uniform method of collecting and tabulating data in each country makes an accurate comparison rather difficult, but the general trend of progress can nevertheless be determined. It is stressed that it is not easy to confine the subject strictly to progress without at times trespassing on the field reserved for other speakers.


1943 ◽  
Vol 3 (2) ◽  
pp. 152-163
Author(s):  
Joseph G. Rayback

In his autobiography, Cheerful Yesterdays, Thomas Wentworth Higginson, looking back on the long crusade that ended with the abolition of Negro bondage in the United States, declared: “The anti-slavery movement was not strongest in the educated classes, but was primarily a people's movement, based on the simplest human instincts and far stronger … in the factories and shoe-shops than in the pulpits and colleges.” Few people have challenged this statement, which Higginson made in 1898; probably because the scarcity of material on the subject has prevented a thorough examination of all its implications, and especially of the main argument that the laboring man was the real force behind the antislavery crusade.Yet there is sufficient evidence to throw serious doubt upon the accuracy of Higginson's statement, evidence which reveals that workers in shops and factories often exhibited an almost callous unconcern for the entire crusade.


2005 ◽  
Vol 8 (16) ◽  
pp. 199-218 ◽  
Author(s):  
Louis-Edmond Hamelin

The great advances that geomorphology has made in recent years make necessary a critical re-examination of the relationships between this science and the field of geography. Is geomorphology truly geographical ? And if not, how can it become so ? Geomorphology has its roots in geology and was, of course, not designed to meet the specific needs of geographers. Under the leadership of W. M. Davis, geographers eventually adopted the study of geomorphology but did Utile to adapt it to particular purposes of their discipline. Most geographers can never aspire to true excellence in geomorphology because of their generally inadequate training in the physical sciences. We have found that most geographers tend to fall into one of four groups : 1. Those who consider themselves to be geomorphologists (about one-fourth of all geographers) ; 2. Those who just try to be informed in geomorphology ; 3. Those who ignore the existence of geomorphology ; 4. The « complete » geographer who practices a « functional » geomorphology. It also appears that the majority of geographers do not consider land-man relations to be their principal field of interest. The definition that we as geographers give to geography tends to sanction the kind of geography that we are capable of doing. For example, the classical géographie globale, which is characterized by an explanatory description of a complex of physical and human eclectic elements, does not normally require either a « complete » or a genetic geomorphology ; also, complex techniques of geomorphological investigation are not essential. Of greater importance is a geomorphology'-which is functional to geography and which will help us to understand better man's distribution and activities on the surface of the earth. This partial or « functional » geomorphology has achieved its greatest development in France (as an integral part of géographie globale) and is practised by a large number of geographers. Géographie totale, an expression which refers more to the subject matter of this geography than to its methodology, is an ensemble of specialized yet inter-related disciplines (one of which is geomorphology). This pluralistic geography daims many more adherents than does géographie globale. Géographie totale allows us to study all aspects of what is now called geomorphology (but which may eventually be termed « cosmomorphology  »). This new geomorphology is based on geophysical laws and is strictly quantitative. It is an integral part of the physical sciences but this does not mean that it is automatically divorced from man. Scientists of both the United States and the U. S. S. R. are actively engaged in this new geomorphology. We believe that it would be mutually advantageous for both the « functional » and the « complete » geomorphologists to group themselves into a new international association. To achieve this end we urge that the structures of the international Geographical Union be modified or that an « International Association of Geomorphology » be founded.


Design Issues ◽  
2017 ◽  
Vol 33 (2) ◽  
pp. 31-42
Author(s):  
Pedro Ignacio Alonso ◽  
Hugo Palmarola

In 1957 as part of the Minitrack Network, the U.S. Army installed a satellite-tracking station in Peldehue, Chile, intended to track radio signals from what was then the United States’ Vanguard project. With the creation of the National Aeronautics and Space Administration (NASA) in 1958, the station came under its new administration, becoming the subject of a process of rebranding that included the monumental installation of the agency insignia, a rounded slab made in concrete and tiles. By examining this object from a design and archaeological perspective - as it nowadays lays abandoned nearby its original location - this paper attempts to advance our understanding of the Chilean station in terms of its place within a much larger global network by analyzing it within the intersection of design, military economies, technologies, ideologies, and cultural and geospatial considerations.


Author(s):  
Karen A. Walder ◽  
Steven D’Alessio

Demand for power in the United States is projected to increase between 2 and 4 percent per year for the next 10 years based on various studies. At the same time, the rise in environmental regulatory restrictions has made it increasingly difficult and expensive for utilities to meet these growing power demands with traditional power sources. During the 1960’s and 70’s hundreds of gas turbine electric generating units were installed in the United States. Many are now approaching the end of their useful economic lives owing to increased maintenance and fuel costs. With the major advances in both fuel efficiency and exhaust gas emission quality power producers are looking toward the repowering of existing plants with modern gas turbines such as the FT8. (Day and Koehler, 1988) This paper describes the design of Turbo Power and Marine Systems’ (Turbo Power) FT8® repowering package for the present FT4 powered plant at Public Service Electric and Gas Company’s (PSE&G) Burlington Generating Station. Given the objectives of minimum design effort and minimum field construction time, the retrofit package provides an optimal blending of existing FT4 and standard FT8 equipment. Performance, impact on operation, reliability, and availability of the FT8 industrial gas turbine were also important considerations in the retrofit design.


Author(s):  
Justin Zachary

Since 1998, the United States has experienced a tremendous increase in power generation projects using gas turbine technology. By burning natural gas as the primary fuel and low sulfur oil as a back-up fuel, gas turbines are the cleanest form of fossil power generation.


1926 ◽  
Vol 45 (4) ◽  
pp. 334-345 ◽  
Author(s):  
W. J. M. Menzies

Included in the area of distribution of Salmo salar are the western coasts of Europe as far south as the Franco-Spanish border as well as the British Isles and Iceland, and, in addition, the eastern coast of Canada and the United States down to the State of Maine. A very large number of investigations have been made in Great Britain and various European countries, both by marking the fish in order to trace their subsequent growth and movements, and by reading their age and history from the scales. Length calculations from scale measurements have also been made in Scotland, Norway, and Sweden.


2019 ◽  
Vol XV ◽  
pp. 33-59
Author(s):  
Marian Mencel

As a consequence of the intensification of nuclear tests and long-range mis-siles, the Democratic People's Republic of Korea has become the subject of debates and pressure from the international environment, which is mani-fested by the increasingly stringent sanctions imposed by the UN Security Council, complemented by diplomatic pressures and intensified political influence on Pyongyang by the United States and China. As a result of their application, the relations between the two Korean states were warmed up, and the North Korean leader, Kim Jong Un, proposed to implement the process of denuclearization of North Korea and a direct meeting with the US President, Donald Trump. Why was there an unprecedented meeting and what are the consequences? How was the meeting perceived by the American regional allies? What is the position of China in connection with the events? What are the prospects for progress in contacts between North Korea and the United States, South Korea, China and Japan? Is it possible to fully denuclearise the Korean Peninsula? An attempt to answer these ques-tions has been made in this article.


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