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公开(公告)号：JP2003194337A
公开(公告)日：2003-07-09
申请号：JP2001391789
申请日：2001-12-25
Applicant: NAT AEROSPACE LAB , NIIGATA ENGINEERING CO LTD
Inventor： HAYASHI SHIGERU , YAMADA SHUJI , FUJIWARA HIROSHI
Abstract: PROBLEM TO BE SOLVED: To provide a preliminary fuel-air mixing tube which reduces backfires without degradation in flame holding performance of the mixture in a swirling motion. SOLUTION: A first swirler 2 for counterclockwise turn is provided on the inner side and a second swirler 3 for clockwise turn is provided on the outer side, with a multiple hole fuel nozzle 1 for gaseous or liquid fuel injection positioned at the center. A premixing tube 4 is a roughly hollow truncated cone (or pyramid) having a virtually circular (or rectangular) cross section, with the cross section growing smaller toward the outlet. The ratio of the area of the nozzle 1 at the injection tip to the area of the outlet is 40%. It is so arranged that 0.02 COPYRIGHT: (C)2003,JPO
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公开(公告)号：JP2001235112A
公开(公告)日：2001-08-31
申请号：JP2000042552
申请日：2000-02-21
Applicant: JAPAN SCIENCE & TECH CORP , NAT AEROSPACE LAB
Inventor： HAYASHI SHIGERU
Abstract: PROBLEM TO BE SOLVED: To provide a burnt gas discharging self-circulating burner which does not allow a burnt gas to be readily mixed with a premixed gas or fresh air even when the burner makes continuous combustion without using any blower, compressor, nor pump. SOLUTION: This self-circulating burner is constituted in such a way that, in an outer duct 1 constituting this burner, a fuel injector 2 is set up nearly concentrically with the duct 1 and, at the same time, an inner duct 6 is arranged nearly concentrically with the duct 1 at a distance from the injector 2 on the downstream side of the injector 2. Then an annular passage 7, through which a mixed gas of fuel and fresh air is made to flow, is formed between the external surface of the inner duct 6 and internal surface of the outer duct 1 and the upstream side of the inner duct 6 is caused to communicate with the passage 7 and part of the burnt gas is made to return to the annular passage as a circular glow by utilizing a bottom pressure section formed in the inner duct 6.
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公开(公告)号：JPS6244645A
公开(公告)日：1987-02-26
申请号：JP18456785
申请日：1985-08-22
Applicant: NAT AEROSPACE LAB , RETSUKUSU KK
Inventor： HAYASHI SHIGERU , WATANABE SHINICHI
Abstract: PURPOSE:To shorten a measurement time and to reduce the size of a measuring instrument by irradiating a group of sprayed particles with a laser beam, converting light scattered by the atomized particle group and photodetecting it by a photoelectric element, and calculating particle size instantaneously on the basis of a current signal obtained by the photoelectric element and displaying it digitally. CONSTITUTION:The laser beam irradiated by a laser beam oscillator 1 is collimated by a collimator lens 2 into parallel laser beam 3, which illuminates the group 3 of sprayed particles to be measured. An optical lens 5 is provided to converge light transmitted or scattered by the particle group 3 and photoelectric converting elements 6 and 7 are arranged concentrically at the focus position of the lens 5. Current signals from the elements 6 and 7 are amplified by logarithmic amplifiers 8 and 9 which have the same characteristics and inputted to a subtracting circuit 10. The output of the circuit 10 is inputted to a computing element 12 through an A/D converter 11 and the arithmetic result is displayed digitally on a display device 13. Thus, the measurement time is shortened and the size of the instrument is reduced.
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公开(公告)号：JP2002048700A
公开(公告)日：2002-02-15
申请号：JP2000238387
申请日：2000-08-07
Applicant: NAT AEROSPACE LAB , NIKKISO CO LTD
Inventor： HAYASHI SHIGERU , OHATA MANABU
Abstract: PROBLEM TO BE SOLVED: To provide a method and an apparatus, for the measurement of a particle size distribution, wherein it is not required for a measuring operator to set the refractive index or the like of a powder sample and the particle size distribution can be measured automatically and with high accuracy. SOLUTION: The method and the apparatus are provided with a procedure wherein the sample in a measuring region 4 is irradiated with irradiation light from a light source 2 capable of generating the irradiation light at a plurality of different kinds of wavelengths, a procedure wherein an intensity distribution corresponding to the scattering angle of scattered light obtained when the irradiation light is diffracted and scattered by the sample is measured regarding the irradiation light at the plurality of kinds of wavelengths and a procedure wherein the value of a prescribed computing constant is supposed, the particle size distribution corresponding to the plurality of kinds of wavelengths is computed on the basis of the intensity distribution of the scattered light due to the irradiation light at the wavelengths, the agreement property of the particle size distribution corresponding to the wavelengths is evaluated, the value of the computing constant is changed and the value of the computing constant is decided.
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公开(公告)号：JP2001141639A
公开(公告)日：2001-05-25
申请号：JP32497399
申请日：1999-11-16
Applicant: NAT AEROSPACE LAB , TONICHI COMP APPLIC KK
Inventor： HAYASHI SHIGERU , TAKAHASHI TADASHI
Abstract: PROBLEM TO BE SOLVED: To accurately measure the particle diameter distribution of a group of particles by adopting an analysis part storing the shifting procedures of a particle diameter section and the subdivision procedures of a particle diameter division. SOLUTION: An initial particle diameter section S1 that is composed of continuous particle diameter sections T is set, whose number is equal to or less than the number of photo detectors where the minimum and maximum particle diameters are set to lower and upper limits, respectively. When the probability density of each of the particle diameter sections T is obtained so that a prediction scattering energy vector for the probability density coincides with an actually measured scattering energy vector to the maximum within a range where the probability density of the particle diameter section T does not become negative. Hence when either probability density out of the maximum particle diameter section Tmax and the minimum particle section Tmin exceeds a specific value, the particle diameter distribution of the group of particles is obtained based on new particle diameter sections S2, S3,... being obtained by shifting the particle diameter section where the prediction scattering energy vector coincides with the actually measured scattering energy vector to the maximum to large and small particle diameter sides when the probability density of the maximum particle diameter section and that of the minimum particle diameter section exceed specific values, respectively, by one particle diameter section. The calculation procedure is stored in the analysis part is advance.
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Patent Agency Ranking
公开(公告)号：JPH07103426A
公开(公告)日：1995-04-18
申请号：JP27118393
申请日：1993-10-05
Applicant: NAT AEROSPACE LAB
Inventor： HAYASHI SHIGERU
Abstract: PURPOSE:To provide a low NOx burner which is released from such problems as spontaneous ignition and back fire and which is capable of inhibiting the emission of unburnt components in a very thin combustion state and providing high combustion efficiency. CONSTITUTION:This burner comprises a ring-shaped passage 23 which allows combustion air to flow into a combustion chamber, a swirler 21 which is installed to the ring-shaped passage and circulates an air flow flowing in the passage, an air passage 24 installed inside the ring-shaped passage and a fuel sprayer 25 which sprays a fuel to the air flowing inside the passage. The ratio between the air flow rate and the flow rate of the fuel to be sprayed is designed to be smaller than the ratio of stoichiometry in the inside passage while the ratio between the flow rate of the total air from the inside passage and the ring-shaped passage and the fuel flow rate is designed to exceed the ratio of stoichiometry. The inside passage is provided with a swirler 22 which circulates the flow of air. The cross seciton shape of the flow passage is reduced at the outlet to the combustion chamber or expanded after it is reduced.
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公开(公告)号：JPH06117825A
公开(公告)日：1994-04-28
申请号：JP21322692
申请日：1992-07-20
Applicant: NAT AEROSPACE LAB
Inventor： HAYASHI SHIGERU , HORIUCHI MASAJI
Abstract: PURPOSE:To obtain a method and an apparatus for measuring the size of a linear or band-shaped object having several tens mum or smaller thickness or width. CONSTITUTION:A laser beam 2 is cast to a linear object measured 1 and a scattering light 3 is condensed by a lens 4. Supposing that (f) is the focal length of the lens, (r) is the distance of the light on a focal surface 5 from the focal point and I(r/f) indicates the intensity of the scattering light on the surface 5 at r/f, the diameter or width D of the linear body 1 is obtained from the position where I(r/f).(r/f) becomes maximum. In another way, the D is obtained by detecting the diameter or width when the sum of squares of the difference between the theoretical value Ert of the energy of the scattering light at the distance (r) and the actually-measured value Erm, i.e., SIGMA(Erm-Ert) becomes minimum.
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公开(公告)号：JPH01284738A
公开(公告)日：1989-11-16
申请号：JP11309888
申请日：1988-05-10
Applicant: NAT AEROSPACE LAB
Inventor： HAYASHI SHIGERU , HORIUCHI MASAJI
Abstract: PURPOSE:To measure particulate size and its distribution by irradiating parallel single-wavelength polarized luminous flux on a particulate or particulate group to be measured whose size is nearly equal or smaller than the wavelength of the light, and measuring the intensity of scattered light and scattering angle in the plane of polarization of the illumination light. CONSTITUTION:A helium neon laser 1 which emits linear polarized light irradiates the particulate group 2. Front scattered light is converted on the focal plane of a condenser lens 3 by the condenser lens 3 together with linear light to form a ring-shaped intensity distribution corresponding to the scattering angle. A beam expander 7 increases the beam width when the particulate group has a spatial spread. An array 4 of photoelectric converting elements for detecting parallel (i2) and an array 4' of photoelectric converting elements for detecting (i1) perpendicular to it are arranged at a convergence position and output signals corresponding to the intensity of scattered light in each direction. Then the particulate size and its distribution are measured from the angle distribution of the scattered light intensity.
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公开(公告)号：JPS63263444A
公开(公告)日：1988-10-31
申请号：JP9821687
申请日：1987-04-21
Applicant: NAT AEROSPACE LAB
Inventor： HAYASHI SHIGERU
Abstract: PURPOSE:To calibrate a measuring instrument extremely easily with high accuracy by using a calibration instrument constituted by arranging many circular or opaque disks which have a diameter >=20 times the wavelength of light at random. CONSTITUTION:The calibration instrument is formed by forming at random circular holes 7 which have a diameter >=20 times the wavelength of light in a opaque flat plate 6 or arranging multiple opaque disks 9 having said diameter on a transparent flat plate 8. Plural calibration instruments which differ in the diameter and number of the circular holes 7 or disks 9 are put in a particle group 3 and an intensity distribution obtained on a focal plane 2 is analyzed to find a parameter X1 of a concentration calibration line. Then a proportional coefficient K is determined from the relation between 4/3pia N and X1, where N is the number of the circular holes 7 and (a) is their diameter. Consequently, the proportional coefficient K can be determined by a measurement optical system itself and the measuring instrument is calibrated extremely easily with high accuracy.
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公开(公告)号：JPS6244646A
公开(公告)日：1987-02-26
申请号：JP18456885
申请日：1985-08-22
Applicant: NAT AEROSPACE LAB , RETSUKUSU KK
Inventor： HAYASHI SHIGERU , WATANABE SHINICHI
Abstract: PURPOSE:To measure the concn. and grain size of pulverous suspended particles by irradiating a laser beam on the pulverous particle group to be measured, condensing the light scattered forward at slight angles, detecting the collected light with an annular photodetector having at least three channels and analyzing the detected respective channel signals. CONSTITUTION:The laser beam 1' from a helium neon laser oscillator 1 is expanded by a beam expander or collimator lens 5 and the expanded laser beam is irradiated on the particle group 2 to be measured. The components in the direction of the scattering angle theta out of the scattered light of the laser beam colliding against the particle group 2 are collected onto the circumference of a prescribed radius at the focal plane of a photodetecting lens 3 regardless of the position or speed of the particles. The annular photodetector 6 of a concentrical circular shape having at least three channels of the photodetecting parts is positioned to the focal plane thereof to directly detect the intensity I(theta) of the light. The output from the detector 6 is inputted to an instrument 7 for measuring the quantity of light energy, by which the concn. and particle size of the suspended particles are determined.
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