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BerichtGeplaatst: 06-11-2018 08:56:57    Onderwerp: combinations are poss Reageren met citaat
(Source: CGTN)


China to build cross-provincial national park for giant panda


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Rally held in Greece to commemorate murdered anti-fascist activist


Protesters riot for third night in U.S. city of St. Louis


China to build cross-provincial national park for giant panda


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VILNIUS, Sept. 18 (Xinhua) -- Lithuanian Foreign Ministry on Monday summoned Russian ambassador and handed a diplomatic note expressing protest over what it claimed as "a violation of the Lithuanian airspace".


The incident took place in the evening of Sept. 16, according to the ministry.


"Two Russian military aircrafts IL-76 entered Lithuania's airspace and stayed there for up to 2 minutes," said the ministry in a press release.


The two military planes were flying from mainland Russia to its exclave of Kaliningrad, bordering Southern Lithuania, said the ministry. Lithuania, a small Baltic country with a population of less than 3 million, is the Eastern flank member country of NATO.


The Lithuanian foreign ministry "expressed its protest to the Russian ambassador and requested competent Russian authorities to provide and explanation over the incident as soon as possible."


The incident took place during the Zapad 2017 military drill, held by Russia and Belarus on the border with Lithuania, Poland and Belarus.


Vytautas Bakas, the chair of the parliamentary committee for national security and defense, said the incident shouldn't be a surprise for military officials, politicians or Lithuanian public.


"This shouldn't be a surprise given the large scope of the exercise," Bakas told local media.


The Russian defense ministry has repeatedly stated that flights by Russia's Aerospace Forces are carried out "in strict accordance" with international regulations on the use of airspace over neutral waters, according to a report by Sputnik.


A week of strategic military exercise Zapad 2017 officially started on Thursday last week.


Currently, the Baltic skies at the Eastern flank of NATO are being policed by the U.S. rotational Air Force. Last month the United States has deployed seven fighter jets F-15C Eagle at Siauliai air base, Northern Lithuania, to take over the air policing mission. In recent two years, usually four allied fighter jets would conduct air policing missions from Lithuania.


China marks 86th anniversary of "September 18 Incident"


Panama's president, Chinese FM inaugurate Chinese embassy in Panama City


Interview: China's B&R Initiative positive to world -- Singaporean PM


Chinese embassy in France opens for first time in European Heritage Days


Special snacks displayed during 14th China-ASEAN Expo


Scenery of paddy fields in Baicheng, NE China's Jilin


China Focus: World's oldest panda dies aged 37


Scenery of terraced fields at Wuyishan in SE China's Fujian

Ventilation fans are tested using procedures specified by Air Movement and Control Association International Inc. (AMCA), Illinois, USA. The fan under test is mounted near the outlet of the test rig and air in-flow through the rig is varied by the movable gate assembly situated at the other end of the test rig.

Fan efficiency is defined as the ratio of air power (output) to shaft power requirement (input). An optimally designed fan impeller with improved aerodynamics requires less shaft input power for desired delivery of air volume with total pressure rise as per the system requirement. With reduced shaft power requirement, there is a commensurate reduction in energy consumption.

In a typical axial fan, the effective progress of the air is straight through the impeller at a constant distance from the axis. The primary component of blade force on the air is directed axially from inlet to outlet and thus provides the pressure rise by a process that may be called direct blade action.

The blade force necessarily has an additional component in the tangential direction, providing the reaction to the driving torque : this sets the air spinning about the axis independently of its forward motion.

The air delivering capacity of axial flow fans ranges from 100 to 500,000 cubic feet per minute (3,000 to 15,000 cubic meters per minute). Impellers usually have blades with airfoil cross-sections.

As compared to curved sheet blades, aerofoils can apply greater force to the air, thereby increasing maximum pressure and can maintain better efficiency over a wider range of volumetric flow. Also by increasing the thickness & curvature of the inner sections, the blades can be made stiffer, this limits flutter and allows the impellers to be run at higher speeds.

Selection of a a right fan one should consider such factors like cost optimization, power rating & noise levels govern the selection of a fan suitable for a given application. Various combinations are possible to meet any given duty or operating requirements for best performance, lesser noise, power and cost characteristics.

Once the volume of airflow and the static pressure of the system are known, it is possible to specify a fan. The governing principle in fan selection is that any given fan can only deliver one flow at one pressure in a given system. To select a fan one must consider the following parameters:

- total airflow required

- total operating pressure

- fan installation space

Thus the fan efficiency is directly contingent upon selection of fan and the operating point relevant to the system resistance.

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